If you get more than about five pages, mashing a button to cycle between them all gets fairly slow.
At that point, you'd want to make a sort of 'main' page, where you could push one button for every other page you want to go to.
e.g. 1. Motors page, 2. temperatures page, 3. hydraulics page, etc.
Then make it so the ESC button just gets you back to the main page.
You could do other stuff, but this is the easiest way that I've thought of.
As for the wiring in GUIDE, there's a trick.
You need a signal that's shared between all pages you make both for reading, and writing the value on that signal.
There's only one way I've found to force GUIDE to allow multiple pages to all access the same signal for modifying the value:
value connect
It's under component -> switch, counter, memory -> value connect.
See the first attachment for a basic page, which illustrates this.
You'd need one of these pages for each "screen" you're navigating between on the physical DP6XX screen.
Outside of these pages, you'd wire each "active screen" output to each other, so that it's the same signal, shared between pages.
The second attachment shows this.
There's possibly a better way to do this, but this seems to work well enough!