Hi Patrick, welcome to the forum!
To achieve what you want you can narrow down the list of targets filtering them by size. Just go to Targets > Deep Sky and make sure to enter something in the Apparent Size filter section inside the Search Parameters box.
If you know the FOV of your setup, it’s just a matter of setting the minimum/maximum DSOs apparent size to some reasonable values around that. The Andromeda Galaxy is about 3.2 degrees wide, so based on what you say you might want to set the filter to display objects between 20-30 arcminutes and 4 degrees?
If you don’t know the exact FOV of your setup, you can use the Telescope Simulator to calculate it. Just enter the details of your telescope and camera and read the info in the screen. In the following example, you can see the framing FOV is 0.97 x 0.74 deg.
Hope this helps!