@angelo2008 Please wait at least six months before bumping a suggestion/request, specially your own.
If someone find your suggestion interesting, s/he will reply showing the support for it, you should not expect any replies when you post a suggestion here.
Scratch that. Its gone again. Restarting fixes it but restarting every few minutes is gonna get irritating real fast.
edit: sometimes it just decides to come back without a restart as well
@gerardominic Did you do what I said? What was the result?
If a page is showing up when you start Opera, it's because either it was already opened in the previous session and Opera just recovered it or the page was set up to open when Opera is started.
Other than that, only a bug, extension or malware.
@drakodan Open opera://flags/#sidebar-site-panel [copy - paste it, or simply open opera://flags and search for "sidebar-site-panel"] and set the highlighted flag to Enabled
Then you can add up to 5 custom sites to sidebar in sidebar's settings menu [triple dots at bottom]
Btw. it's maybe an experimental feature, since its disabled by default, but [for me] it works nicely.