Now I would like to mention a few things I noticed at work.
Remember the width of the properties and objects boxes or set the minimum width as default. I have to pull it a bit smaller after each start so I can see more of the scene.
Make the objects-properties window wider.
The event windows are 100% and properties only 40%.(on my screen)
It is very hard to work with animations if you can only see 7 frames in the same time. Adding a numbering in the upper left corner would also helps a lot. e.g. then it is possible to add or duplicate a sprite and move it to a specific place. Currently it is almost impossible if the graphics look similar.
A zoom with mouse-wheel + hold Ctrl in the animation preview would be nice. And the animation preview window is very low, I think it should be near square.
The game preview is ~9% smaller than the things really are. I think the "Game size mode" config and ratio is not the problem/solution. But I think it's understandable why it would be very good and important if the preview has the same size as the graphics in the graphics tool.
The 1-pixel offset bug was fixed in beta62, but not the hitbox preview.
Maybe also a zoom would be possible. And please don't bind a custom collision mask corner point to the mouse cursor when I move it beyond the sprite. This makes no sense and so it's not possible to put him on the edge or in a corner.
Move "About GDevelop" from "File" to "Help" dropdown menu, as in 99% of all programs.
Add a browser favicon to the website and the forum.
Thank you for your work, the frequent updates and the great game creation help in forum! :)