Positioning items in a container

So it was originally, but I don’t know how correctly it will be displayed on different resolutions and mobile devices, the goal is to avoid pixelation (poor image quality) and fix the locations of gui elements, because now elements at different resolutions are displayed in different places)) on friend etc.
Or use percentages to arrange elements on the "main screen", and use pixels to arrange elements inside containers. Although, in theory, AdvancedDynamicTexture (what I mean by the main screen) where all the controls are located is the same container
I took the idea of ​​switching from pixels to percent from here: