Just like in file explorer.
if you mant to mark several files in a row,
Shift+click on the first item, then scroll (slowly!) to the last item and Shift-click on that. all items inbetween are now selected as well.
For selecting non-contiguous items hold down the CTRL key and them click on the items.
Then click on the pencil icon, which appears as soon as you have selected several items at once
If you scroll while selecting, do it slowly!
