Hope you are doing well. Thank you for writing in!
Are you referring to removing the file names from your recent list? If yes, you can use the three dots to the top-right-> click select-> select the files, and then use the "minus" icon on the bottom menu to remove the files from your list.
If you want to delete the files completely from your device, you can follow the same steps above, and instead of the "minus" sign, click on delete.