How do you show a full screen?? Just installed my unit, and with all the p/w and manuals there doesn't seem to be section which details screen selections / options (like on my vx2's, which are super easy to find) - sorry if it is obvious - maybe my head is just still spinning from try to figure out the wiring of the IF-NMEA2k converter! (and the extra black wire which is not shown in manual!?)
The manual calls them HOT PAGES.
With the TZTouch, hit the home button and if the default selections doesn't have what you want (like a full screen sounder screen) then hit EDIT at the top right and create the selection you want.