Stuf Unit Frames Anchoring

[Fhorau]

I made an UI compilation and I want it to work with all resolutions. Everything is anchored to "BOTTOM" and placed in the lower half of the screen, so the aspect ratio doesn't matter. Just Stuf is still anchoring the default way and doesn't fit with diverse ratios. It has no in-game anchor settings.
How can I change it? Do I need to rewrite anything in the LUA code? If so, what?