By using CTRL+left click and hold, or using right click and hold, I am able to drag the protein off the screen, so the game doesn't have to continuously update the display. I can do the same for the contact map.

CTRL+left click and hold while dragging will bring the protein back into view, as does hitting HOME or right click and hold while dragging. But none of these restore the contact map.

The "help" function in the game doesn't show to restore the contact map. Is there a keystroke combination to use that I missed?