@Larsterno: It is via
NickelMenu (which is bundled here).
c.f., the rescan_books family of actions, in particular.
(Because, yes, this is the expected behavior

).
EDIT: If you're not actually using KOReader to read, I'd recommend looking into @shermp's
Kobo UNCaGED, which is currently being revamped to make this very workflow less cumbersome

.