When I try save some script, scene or something else, the save window rarely points to prepared by me folders(_Scripts, _Scenes, _Fonts), so I must find it. I wanna to be able to set the default resource folders in the editor/project settings(like image below). I think this should be disabled by default.

The save window, probably take last save location, but this is only sometimes useful. Here is example, how I create a script, and path was automatically set to _Scenes

Duplicate of #15231
Just to note: Godot recommendation is not to use that structure (you should organize your project by meaning in-game, not by type of file). You can also use the favorite directories feature.