Is it possible to add a scroll bar to the side or limit the size of the pop up when clicking on the teleporter? I have so many planet mods active that i cant see the bottom of the list. I also cant see a way to automatically teleport when full, i assume the toggle is somewhere i cant see

With a lot of planets the bottom of the UI gets cut off. I hope to address this at some point but I've been busy with other things lately.

This has been addressed in 1.0.28. There is now a setting to enable "Compact GUI."