I just created a UI panel, and used the layout button to fill the whole viewport. Then I saved it . When it drag it to another scene, it shrink back to whatever it was instead of fill whole screen thing when it was saved. Is there a apply button or something that keeps the size?
It happened sometimes to buttons and box container as well. I am not sure what I did wrong
Edit: Did more digging, I found that if I set min size in rect it will keep the size .