2019-6-28 · Click LMB on the marker’s triangle to select it. Use Shift-LMB to select multiple markers.. In the Graph Editor, Dope Sheet, NLA Editor, Timeline, and Video Sequence Editor, you can also select all markers with A while hovering the mouse over the marker row, and apply selection tools on them like Box Select, etc. (as usual, LMB to select, RMB to deselect).