Retrigger Selected Cells or Focused Scene    ⌃⌘↩

Retriggers the selection. No need to move the mouse and click on it. Lots of new things with Live Loops.

Start and stop Live Loops cells in Logic Pro — Apple Support

Retrigger: If a cell is playing and you click it again, it starts playing from the beginning. Cells set to Retrigger can be stopped only by starting another cell in the same row, by stopping the row using the Divider column, or by stopping the entire grid.

Live Loops Grid key commands in Logic Pro — Apple Support

The following table reflects default key commands included in the U.S. factory preset.