In bush trips muliplayer is on by default.
Turn on multiplayer > apply and save
Turn off game and try
my solution
Open folder
Official > One Store > asobo-liveevent > Missions > Asobo > LiveEvent
In notepad open file named
LiveEvent.FLT
Scroll down to
[Multiplayer]
Status=1
Change 1 to 0
and save changes
[Multiplayer]
Status=0
Before
After
Source
https://forums.flightsimulator.com/t/discussion-poll-world-update-v-1-17-3-0/410185/505