Steps to reproduce the issue

Two ways - first is how I first saw it.

1. Users -> User Notes -> New -> +Create (Category) = Modal

Depending on your screen width and responsive breakpoint verses screen your results will differ.

Screenshot taken on maximised browser on half the 27inch iMac screen. Approx Browser window size: 1600 x 1566 on Screen size: 3200 x 1800 - I.e a HUGE SCREEN for a browser

2. This way is better for testing as you can "squeeze your browser" to different breakpoints to see the effect. The tags select box is much worse than the others and I think the only one that needs fixing.

Users -> User Notes Categories -> New

Expected result

That layout is sensible for all responsive breakpoints, and when loaded in modal windows

Actual result

Described above.

System information (as much as possible)

Safari on Mac

Additional comments