I think you haven't planned any particular route.If just flying around, create a route with a diameter of whatever NM you require. SD gives a selection.
That will also bring up any NOTAMs in your flying area and local weather from reporting airfields
Go flying and then when you want to get home, a long press on the SD orb. (top left of display).
Then select "Go To' for your home airfield and a track line will appear.
If you follow this method your in-flight timers (a row at top of display) will display time to destination etc.
You need to select the instruments first in the setup.
Hope this helps
Tony