Problem:

It seems like the dropdowns can only be closed by clicking again on it.

This is sometimes annoying, as we often tend to click elsewhere to close any kind of UI overlays, like modals, popups, etc.

An example of dropdown with this behaviour is the "Link type" in the select property setting of an object type.

Solution:

Allow to close a dropdown by clicking outside of it and also by tapping the Esc key.

P.s. I categorized this as improvement, but would also categorize it as a bug, as this would fail accessibility compliance.