I think you need to read the datasheet to get the information you need. You can find it here: https://www.siglenteu.com/spectrum-analyzers/sva1000x-spectrum-vector-analyzer/ (button "spec sheet" on the bottom right).
I have pointed directly to the SVA1032X page, because it is what the SSA3021X+ becomes after some simple magic tricks.
Spec shit I mean sheet.. I already know the vna dynamic range around 90db for the VNA. I'm asking if the spectrum-analyzers portion of the units will read lower using SA & TG to set reject notches down around 120db. To basically pick up where the vna portion leaves off.
I called siglent today. They said they "should"..I thought it was odd it wasn't a definite yes answer.
So that's why i have been asking here for help about that. Looking for users to chime in with will or won't.
I've had one other ham on YT give me a fairly direct answer. That it will eventually, but it woukd take time trying to get it dialed down & 120db might be a stretch.
So I like to ask questions & get feedback from live users on what they know about their machines. Often that feedback is more real than what specs & marketing tactics try to tell you.