This procedure is for some of their other projectors. I've also seen instructions that say to hold the "swap" button for 5 seconds so maybe you can experiment and get it.
Push MENU. Go into OPTION. Go to "OSD" and turn ON. Hold down "ENTER" button for 5 seconds. The Service menu should appear. Switch the Freeze display to OFF. Push MENU to leave the Service menu.
Disclaimer: I don't have a Panasonic. If you mess yours up it tain't my fault.