How to build low resolution pixel art game?

I build my game in window mode, and i select resolution 1024 x 768.
And as you see in the pics, UI is too small and that's not what i want...


https://ibb.co/Th6bQ85

the resolution i select in game view is 256 x 224. And i use pixel perfect camera.
I expected the final build is like this..


https://ibb.co/YDzgGHN

the image resolution is 256 x 224.. and text size is 8.

should i rework setting resolution in free aspect..?
or is there any way upscale my UIs or enlarge..?

thanks

 

Make sure your canvas has a CanvasScaler component, that controls how the Canvas will scale from the reference resolution to the current resolution.

https://docs.unity3d.com/Manual/script-CanvasScaler.html