Hello Blender development, I found it when I in " Movie clip editor " and in " Mask " Mode I can’t use left click to select.( I set it as Left click). I don’t mind to use right click to select but the thing is, when I want to multi-select the dot, I then press shift and right click it, and it was a shortcut for 3D cursor.
Therefore, I hope Blender development can help me with this issue.
Thank you.