I have similar issue but thumbnails are back after reloading the SD page.

I have the same on Win 8.1 x64 on both PCs.

EasySetup menu button, unpinned sidebar(which is less transparent now too) and scrollbar should be in one style, I think.

I tried site https://whatismyipaddress.com. It doesn't show my real location(Eastern Europe) with VPN on but shows incorrect regions which were selected in VPN settings.

1. I select 'Optimal location' ->hit refresh-> it shows me Country Iran
2. I select 'Europe' -> hit refresh-> it shows me Country Iran again
3. I select 'Americas' ->hit refresh-> it doesn't text any info(I see only ISP Opera Software AS and Services Network Sharing Device). But on the graphical map red dot is on the Switzerland.
4. I select 'Asia' ->hit refresh-> it shows me Country France.

Such feature was in 'old style' Settings page and it was informative. After restyling(Chrome like setting page) it's unclear if lists are really loading/updating after selecting new list or clicking 'update' button.

@burnout426 Or then just to rename 'Done' to 'Close' or 'X' button if they don't want to implement changes(because Vivaldi has more buttons 'save', 'delete' and 'x'). It will be less confusing.

@burnout426 But I don't see difference if I click 'Done' button or I just click empty space outside the popup. The bookmark is immediately added after 'heart' icon was clicked and to undo this I must click 'trash box' icon. That was the suggestion's point not to save any changes without 'done' button pressing.

Suggestion to apply changes and save or move bookmark only after 'Done' button was pressed on 'heart' menu popup(like it works in Vivaldi). Currently the 'Done' button works like 'Close' or 'x' button.

@rejzor In my case, I manage to click on subfolder before it auto opens on hover and all stays visible. Maybe it's Win10 specific bug because @bbildman also doesn't have this issue on Win7. Maybe it's worth writing to the Opera's blog(better with attached screen recorded demo), because it seems that they pay more attention to the blog than forum.
p.s. My current complaint related to the bookmarks bar it is when I right click on bookmark and select 'open in new tab', bookmarks dropdown closes. But when I click on bookmark using mouse's scroll wheel, dropdown stays opened and I can continue opening bookmarks with no need to reselect the folder again.

I can't reproduce it(or I didn't understand steps) on W8x64. When I hover or click on subfolder or on subfolder in subfolder, the whole tree of bookmarks stays opened.