Extend Cell, or Track Selection Up ⇧↑
Extends the cell or track selection up.
Edit Live Loops cells in Logic Pro — Apple Support
Parameters for selected cells appear in the Cell inspector, which replaces the Region inspector when cells are selected. When you select a single cell, the title bar of the Cell inspector shows the cell name; when you select multiple cells, the title bar shows the number of selected cells.
Select events in the Logic Pro Event List — Apple Support
You can use any of the standard selection techniques in the Event List: individual selection by clicking events, multiple selection by dragging, or both of these (without altering the previous selection), in conjunction with the Shift key.
Select tracks in Logic Pro — Apple Support
You can select multiple tracks. When multiple tracks are selected, the first selected track is the focused track. Some operations, such as choosing a patch in the Library, only affect the focused track when multiple tracks are selected.