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.
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.