Yeah, this happened to me in the past as well. And yes, the fix would be to have some minimum size of the sidebar.
>BTW, this issue will still be there even reinstall Geany APP... It's because it's stored in the settings file which is preserved when you re-install the app. You have to remove the ~/.config/geany/geany.conf file to get the default settings or edit it as @codebrainz suggested. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/geany/geany/issues/1753#issuecomment-361758382
