So, I realised that I have a lot of settings to play around with in my app, and that I'm about to start running out of room on my card for it all. I want to make nested settings options, and instead of making a new card just for that, I wanted to make a popup appear with all the appropriate settings for said nested section. My thought was to make a substack, and have it show/hide groups of settings as needed, but I'm having some issues. On computer, when I'm making the substack, it's the appropriate size (just doing something like 400x400 to test for now), and it's working well. The issue though is that when I put it onto my phone, it scales it up to as big as it can without changing the aspect ratio, which just looks terrible.
I had the fullscreenMode of my original stack to "ShowAll", but I changed it to "noScale" in the substack preOpenStack message, after which I tried forcing it to change height and width - it kinda worked, but not really. I noticed that when it got small enough (I was testing smaller sizes to see what would work), it ended up having a large black border around it - it seemed to take up as much overall space as before when it was scaled to fit as much as it could, but the actual stack was much smaller, and to make up for it, the substack had black around it so you couldn't even really see the background of the main stack!
Is there some settings that I'm missing for substacks and Android? I've read some old posts saying that Android will scale it as much as it can no matter what, so if that's the case, is there a better way to do what I'm doing instead of using substacks? I could probably make a group with all the information and have it hidden/shown as needed, but that just seems like so much extra work than having a substack if I can

Thanks in advanced!