P-P output not as high
I think this is mistake.
In some data sheet there is missing output levels when load is Hi-Z.
Maximum levels are same as in SDG1000 series main channel CH1.
Up to 10MHz
Hi-Z load 20Vpp (max +10V and -10V including offset)
50 ohm load 10Vpp (max +5V and -5V including offset)
Sidenote: Using Arb function there can produce example Square, Pulse, or Sinewave.
If there do example over 10MHz Square, pulse, sine (or what ever) it do not automatically limit output level settings because Arb max setting is 5MHz. But this, of course, do not mean that Arb output limited to 5MHz, not even in SDG805. Just have tested 20MHz Arb sine and Arb square out from SDG805.