UE 5.3.2 UMG Scaling canvas to predefined aspect ratio confines

Im having a problem with scaling canvas to desired aspect ratios, in my case from 4:3 to 16:9
I have a canvas with content, and that is wrapped with size and scale box as shown on the first image
UnrealEditor_Az8lobMVUm

I want to define lower and upper limits for size in the size box OR lower and upper limit for aspect ratio, my needs at the moment are 4:3 to 16:9
if I setup a size box as shown in image 2

it is scaling correctly as shown on the gif below, but my problem is that its aligned to upper left, I need it to be centered in both axis, so for example in case of ultrawide it would be a 16:9 centered
UnrealEditor_yx6Ms7ag7i

Alignment settings for canvas and scalebox are as follows: