How do I reset my bookmarks?

Title. How do I make it so I can start reading from the beginning of a comic again after I finish it? As it is there’s no way to go back to the beginning save for rewinding it in the menu like a VCR.

iPad 10.3.3

Long pressing on a comic should show the contextual menu. You can mark a comic as unread when it’s read.

Also, you can select multiple read comics and mark all of them as read/unread from the “more” menu in the toolbar.