Hello! Just purchased this asset pack. I also got same concern for the resize and separate buttons in their own PNG.
Viewing post in Ultimate Pixel Sci-Fi UI set comments
Hello, hope you doing good, im currently working on a major rework for this pack and it will include having buttons in seperate pngs, for the resizable screens u should provide me with more informations, if its blurry you should modify how the engine imports graphic elements and filters textures. if u using godot you may check this youtube video