I noticed recently that when I start Opera the Sync Tabs icon is missing and then randomly after some time it shows up again (I can't figure out now when that happens).
I think that it started to happened after update to Opera 50 (first, stable version). I'm always logged in to my sync account and tabs from different devices are present in Tabs Menu (currently open tabs, recently closed, sync tabs).

Fresh start:	After some time when icon "magically" appears again:

Picking tabs from different devices from Tabs Menu is (in my case) really inconvenient.
I would like to know if it's a bug or a feature (I hope it's bug that's really easy to fix)

Current system info:

Version: 50.0.2762.67 (PGO), Stable, PL
System: Windows 10 64-bit

@giberie Long time ago when the PiP was introduced to newer Opera (post-Presto), seems like Opera had its own implementation of the PiP (no other Chromium-based browser had such feature at this time) they had PiP with caption (it looked like that they've embedded video player/stream into another floating windows so it had basically almost all features of normal player).
Later Chromium added a basic PiP function and Opera's dev switched to it. A Chromium PiP don't support captions and probably Opera's devs doesn't want to diverge the implementation (it's easier to maintain this than fixing bugs alone).

I'm using Opera for many many years now and unfortunately it seems like it's worse and worse browser to work with. They have many neat features which I like (messaging apps in side bar, workspaces, Flow, synchronisation, News feed) but some of them are not working well for many months/years (like synchronisation is a big mess with massive tabs chaos and multiple duplicated devices; Flow sometimes works, sometimes it log off and it's a problem to reconnect devices; random account disconnection which leads to lack of synchronisation). When PiP was introduced it was super with those captions but then they've switch to definitely a little worse implementation (at least from function point of view).
Sadly they're not listening to users and seems they're not intending not to.

@giberie Long time ago when the PiP was introduced to newer Opera (post-Presto), seems like Opera had its own implementation of the PiP (no other Chromium-based browser had such feature at this time) they had PiP with caption (it looked like that they've embedded video player/stream into another floating windows so it had basically almost all features of normal player).
Later Chromium added a basic PiP function and Opera's dev switched to it. A Chromium PiP don't support captions and probably Opera's devs doesn't want to diverge the implementation (it's easier to maintain this than fixing bugs alone).

I'm using Opera for many many years now and unfortunately it seems like it's worse and worse browser to work with. They have many neat features which I like (messaging apps in side bar, workspaces, Flow, synchronisation, News feed) but some of them are not working well for many months/years (like synchronisation is a big mess with massive tabs chaos and multiple duplicated devices; Flow sometimes works, sometimes it log off and it's a problem to reconnect devices; random account disconnection which leads to lack of synchronisation). When PiP was introduced it was super with those captions but then they've switch to definitely a little worse implementation (at least from function point of view).
Sadly they're not listening to users and seems they're not intending not to.

I've just noticed that on my laptop (computer A) I don't see list of actual devices I use (Computer A, Computer B, Mobile A). Instead for a long time I see old tabs and devices I don't use anymore and I can't force Opera to update this state.
On computer B and mobile A I can see tabs of currently used devices, only on computer A I have a problem which state stopped on state from like few months ago.
I also have installed Opera Beta on same computer and I can see different list but it is also out-of-date (despite turned on sync)

I tried to log-out and log-in again, with and without restart - without result.
Bookmarks and other stuff are syncing okay (at least I've got current state off other devices).

Any idea for to make it work without reinstalling everything from scratch?

@andrew84 @leocg Okay, thanks for explanation. I hope Opera team will improve video popup (if it's possible). It's really useful despite not being the best productive feature in my case (especially in work hours)

@leocg 3) Okay, I'll observe situation. Back in a day (when I posted about this problem) this didn't helped (I use both my laptop and desktop on same day on daily basis and most of the pages are different and it was hit-or-miss for Tabs button to appear on sidebar)

4. Was it in one of the post on blog? If some I must've missed it. If you can, could you give me a link to reasoning of why video popup works like this? (no sarcasm or trolling, I'm really interested)

Beside these 2 issues we didn't get proper explanation why "Recently closed" feature was so hammered down in terms of usefulness (3 tabs are really small number).

@andrew84 If you're using sync feature it should be visible (at least after logging-in to Opera's sync service).
But as I can see in newer version of Opera (with sidebar settings button) you can enable/disable visibility of Tabs button so you should also check sidebar settings if Tabs button is set to visible.
But I don't know if visibility of this options depends on connecting with Opera's sync service (like in case from the post I made 2 years ago)

For recent releases strange things keeps changing inside browser and we - users - don't get proper explanation why you - Opera team - remove some features or changes currently working and well accepted features.

1. No so long ago "Extension" button appeared on toolbar's extensions side. Do we need this? It just taking space (I don't see option to disable it). We have access to extensions from Menu button, from sidebar, from keyboard shortcut.
2. This new "Search" button. Okay, this feature could be helpful, but why Opera team did throw previous Tabs button to trash and replaced it with half-assed implementation ("Recently closed")?
3. Some sync problems are still not solved i.e. Tabs button on sidebar keeps appearing and disappearing without any clear reason. As one of the mods did write "Type ://activity or just have luck". Do we need luck for feature to work? Really?
4. Popup video. It's really nice feature, but we didn't get explanation why popup v1.0 was replaced by slightly inferior v2.0 i.e. newer version don't show captions on YouTube, and newer version sometimes has problems with reacting to mouse clicks on buttons (sometimes I must click few times on close button to close popup)

And these are only few issues.

There are some great features that keeps with Opera like:

• News feed (I really like how it looks and is served to user)
• Integrated messengers widgets are cool
• Recent Workspaces are great too

@andrew84 From my perspective this Sync button is/was broken for many year. Here's my post about it from 2 years ago:
https://forums.opera.com/topic/24711/sync-tabs-icon-missing-on-sidebar?_=1596806895552

Button was sometimes visible, sometimes not (despite sync always on). Looks like problem is still not solved.

@jbjb Did this procedure fixed problem permanently?
In my case it's totally random if this icon shows up after opening Opera.

@slytheringirl opera://activity (and opera://startpage/activity) open right windows with tabs, but still icon don't re-appear.
It's funny, because I totally forgot about this topic because for a while there was not a single response. Yesterday I've got notification about new post here and it looks like there was some feedback. Nice

Unfortunately this issue is still present, even after over 1 year and I don't know what triggers it. Sometimes Opera opens up and icons is right from the start. Sometimes (more often) Opera opens and icons is missing and later it appears.

1. After updating Opera to latest version (52.0.2871.97, Windows 10 64-bit) some buttons in settings lack translation to polish. For example:

2. And some translations are not present for a much longer time. For example: