How to set screen size in unity?

Question

Unity

Hello.
How can I set the screen size. also the size of canvas elements?
When I export a program to android. and after installation I start, canvas and child elements float. How to fix it?
Is it impossible to do everything right in unity as it should, and then export it to an apk file?

Answer 1

Hang the CanvasScaler on the canvas. It has a reference resolution in certain Scale Modes. Next - everything is sorted out with anchors in UI elements - something to the left edge, something to the right.

Answer 2

In order for the elements not to float at different screen resolutions, you need to add the Aspect Ratio Fitter component to them and set the Aspect Mode values ​​to either Width Controls Height or Height Controls Width, depending on how the screen will be located. If horizontal, then the first, if vertical, then the second.