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you have explored the hamburger menu I guess. If you delete a file (without deleting permanently) you can either, use Ctrl+Z to undo move to wastebasket or use the menu option to do so instead.
IIRC gparted batches up operations and only executes them when you click a button for that. That was enough for me to have some leeway to fix any mistaken operations
Ctrl+Z
to undo move to wastebasket or use the menu option to do so instead.