The patches view contains a simple list of all changes that have been made to the data but weren't yet written back. Whenever changes are being made to buffered data, they aren't directly written back but instead end up in the patches list where they can be reviewed and reverted if necessary.
The list consists of three columns: The address where the change has been made, the original value at that address and the patched value.
In order to revert back a change, simply right click it in the list and select Remove patch.
Patches can also be written back to the original data. To do this, use the File -> Save or File -> Save as... option or CTRL + S.
Instead of writing the patches back to the data directly, it's also possible to export them through File -> Export.... The options found there are able to create patch files in various different popular formats.