There are default Bode plot values within the scope UI but they can be altered to suit your needs. Eg. different sweep frequencies, Voltage etc.
So for example with SDG2122X 0-120MHz sweep and scope will do automatic switching to get high dynamic range also? No silly limitations, real deal?
You'll have to wait a couple more weeks to see all the detail, but some little overview.
When you setup the swept range, the Bode plot horizontal scaling is adjusted to suit. Start and stop limits can be set. The screenshot in the OP is typical of what you see with the phase shift as the fainter trace.
For a large frequency range, the sweep can take some time to calculate and display all the trace but using the 2 ASIC's (1&3 or 2&4 ch's) speeds things up heaps. Yes you can select the channel the Bode plot is performed on/with.
Much depends on the filter you want to sweep as it will have a target frequency so you might first sweep it over a wide frequency range just to check and then narrow the sweep to what will better suit frequencies of interest.
It can take a while (5s) to get through to 1 MHz then it flies.
TBH I haven't gone looking for max frequencies it can manage as I have only 30 MHz available ATM.
When Dave gets one I imagine he'll have a good look at Bode plots to follow on from a vid he did on them some time back.
Edit
From the Chinese website: