The visibility of a trip allows you to choose who can view it.
You can set the visibility when creating the trip or modify it later from your list of trips.
A trip can have three levels of visibility:
Open your travel list.
Locate the trip you wish to modify the visibility of.
Click on the visibility action associated with this trip.

Select the desired visibility: Public, Shared or Private.
The new visibility applies to travel.
➡️ See also: How to share a trip?