AlphaTheta released rekordbox version 7.0.3 on the 27th of August 2024. This update has made it possible to search for tracks within playlist folders. this is mostly a minor update to fix some bugs which helps quite a lot as rekordbox 7 added some bugs. Probably best to update. if your on version 7.0.0-7.0.2 as from my experience they can have a lot of bugs.