(I didn’t think this warranted a whole #tutorials topic but if those wish for it to be posted I can copy and paste this reply. )
For those visual learners, I created this little display so you can figure out how to find the draw distance for your setup.
Step 1: Open up your map, and find the aircraft that is the farthest away from you.
Step 2: Find a waypoint, VOR, or airport closest to that aircraft and click the “Direct To” button. The symbol looks like a “D” with an arrow through it. Because we are unable to “Direct To” the aircraft, that’s why the waypoint option is the only course of action.
Step 3: Change your toolbar item to show “Dist to Dest”. Because you only have one waypoint in your flight plan, it will think that that one waypoint is your destination.
As you will see as depicted, I am at KJFK on the ramp. I found an aircraft that was of a significant distance away from me. In this example the aircraft was near KIAD. As noted in the steps above, I chose a waypoint closest to that aircraft and set that as my “Direct To” fix. You will see that my distance to the aircraft is about 203nm before it disappeared.
These simple steps after trial and error will give you an idea of how far you can expect to find other aircraft. For me, I have finally narrowed it down to about 205 - 209nm before I’m no longer seeing other aircraft. Hope this helps you and others find your limits.