Thanks for your answer.
Yes, like I said it “kinda” does the job but not in a satisfying way imo. This is very noticeable with Texts.
1/ Anchors won’t matter in this case since the whole widget is wrapped in a sizebox wrapped in a scalebox, hence the resolution never changes so the anchors are never needed.
2/ Zooming in and out is not the best way to test indeed, but it works in this case and shows the problem I wanted to point out. Playing with the bottom right arrows also shows the problem, and resizing manually during a playsession shows it as well.
3/ In my case I’ve locked my game to 16/9 so this is not a matter of resolution. Even if I resize my window manually the widget will stay at 16/9. However, the font WILL get smaller and smaller as I shrink the window or bigger if I expand it, and in the process it sometimes doesn’t align properly with my UI or creates new lines if the text is wrapping automatically and becomes “too large”.