Bad resolution for android.

I am newbie in Unity and my english is not perfect.
I have the problem with resolution in my app. I have Samsung Galaxy A50 in home and Galaxy A3.
A50 has 2340x1080 and i target to 1920x1080. On 1920x1080 i have good scale from 800x480 canvas to 1920x1080 - it’s perfect. Problem is with no standard resolutions like my A50. Width on this is stretched out of screen. Pls help me and sorry for my english.

You can customize the aspect any screen size you want on unity. Also you may want to change canvas scaler mode to scale with screen size

You can set resolution screen with build settings for build and you should check canvas settings.