Maybe a little different on ipad, I'm giving directions from my iPhone. Select the recent icon at bottom of screen, then select the icon that looks like a piece of paper with folded corner with a check mark in the middle at top right of screen, then select the files you want to remove, then select the icon that looks piece of paper with a folded corner with circle in the middle top left of screen, select remove file, then click done.
Thanks - I feel so stupid when it comes to Mac things. I selected the folded corner icon and all I saw was "Done". I suppose I should have thought - what was done, since no other instructions were given. Knowing the hidden instructions helps alot.