The HardButtons subpage contains the buttons that correspond to the hardbuttons on the physical device.
Then I copy-and-paste that subpage from the seed page to all other pages in the project. In this case, you would position the 200x480 HardButtons subpage 640 pixels from the left.
Before Saving a project as an xpanel, I typically add a join-free 'HardButtons' subpage that's 200 pixels wide to a single page of the project, positioned at the width of the touchpanel.
