Relevance variant list has no scroll bar

Bug discovered in Hippo CMS 12.6.8, reproduced in Bloomreach Experience 14.

Description:
when a CMS-user adds a lot of component variants, eventually the long list of variants generates no scroll-bar. Which means that the ‘copy-variant’ option, which is by default visible, becomes invisible and therefore not clickable anymore. At Univé we have a case (sponsored search) where we do use a lot of variants.

Expected output:
I expect to access all of them, even when the list is longer than the available size of the window. 

*Actual output:
*I cannot access the variants that are displayed below the size of the window.

*Suggestion:
*add a scrollbar to the window.