How to Reproduce

Selecting an item with long text in a "Single select" field make content below it unreachable/viewable

Expected behavior

Select a long item from the list.

The item is truncated to fit in the select box or the select box allocates space for itself without growing over the lower content.

Observed behavior

Note: The invisible "search box" input element compounds to the problem.
Note: Check multi select for the same problem?