"Showing Partial Tiles" affects all gridded takeoff on any active (open) Pages in the open bid.
Calculating and showing partial tiles requires significant calculation (and system resources). We recommend you leave this option off while drawing takeoff. When you are done drawing the gridded area on the current page, enable "Show Partial Tiles". Disable the option after you review the partial tiles information and before performing additional or editing any gridded takeoff..
The option is turned off when you close the bid, just in case you forget to disable it.