As far as I can see, this drop-down is issued by auto-completion,
offering you to complete the typed name,
Card, to the other components of the
Card React Component API.
These are CardActionArea,
and the others, and also including all sort of other tags that
Visual Code thinks are related.
You are at liberty to click on one of them, which will replace the
tag by the clicked item, or type Esc which will close the list,
click anywhere else which will also close the list,
or continue typing after the
Card which will refine your displayed options
in the drop-down list.
Auto-completion is very useful, but if it's bothering you, you may disable
it in the Options of Visual Code. It's generated by Visual Code itself
and not by any extension.