In T368422, an initial version was implemented to support basic topic selection in order to customize translation suggestions. The "Adjust suggestions view" provides a list of topics for users to select. This is intended to work similar to a Codex dialog component. However, currently it uses a non-standard transition: it appears flying from below the viewport and goes away flying up (not going to the same place where it came from):

Following the Codex dialog component and the current Codex support for transitions, it seems that the standard is for elements to fade in/out.

It is not clear what motivated the use of the current transition. If there is a reason for this to show form below the viewport, we can consider keeping it but adjusting the way the elements disappear by flying back to the bottom too.