How can I see all the Notezilla sticky notes I have stuck to the desktop, in such a way I can easily un-stick the whole lot of them at one time from the desktop, without actually deleting the notes?
Right click on the Notezilla icon and choose the Notes Browser.
In the Notes Browser, go to the 'On desktop' filter.
This will list all notes that are stuck to the desktop.
Select a note and then choose 'Remove from desktop' from this menu:
Watch this short video that depicts it: