The edit history tab just list the same entries you can get from the InfoEdit tool fields comboboxes, that contain the respective fields last text edited entries in a chronological order. It facilitates the access to that data, with a immediate visualization of the top entries, without the need to drop down the comboboxes. As with the file tab you like, you just need to double click the entry to replace the field text with it. You can also drag and drop it in any of the other fields, to replace all the field text or insert at the cursor.