Set Region Anchor to Playhead
It is difficult to find a definition of “region anchor”. The simplest visible sign is the anchor indicator that you see in the Project Audio Browser. Typically a region anchor is at the start position of the region, but it can be moved.
The anchor can be used when regions are moved. If I set the region anchor to the middle of a region I can move the region to a different location typically placing the region anchor position at the playhead position.
Move regions in the Logic Pro Tracks area — Apple Support
If more than one region is selected, all subsequent regions are moved. For audio regions, the region anchor is placed at the current playhead position.