How to keep floating palettes on one screen (dual screen)

Is there a way to force all floating palettes associated with an app to open on the same screen? I’ve used an app called “Stay” for this, but it doesn’t seem to work consistently anymore. Even if I “store all windows” in Stay, some related menu will open way off on another screen. It’s maddening. And I can’t seem to find a good answer online. Thanks for any tips you guys can offer!