Each time a specific sidebar app is opened, it will shrink in size by a few pixel until they reach the minimm size.



Just by opening the Twitter sidebar app 3 times (is the same with all apps) the tab-description on top (pera GX -> Opera GX) shows the change.

I cant remember this happening all the times, so I guess it happened after the most recent update, which is LVL 2 (core: 76.0.4017.208)