Yes! If you would like to limit access for a traveler to view an itinerary or proposal that you shared with them, here's how!

You can get to the Trip Settings by clicking either on the name of the trip, or on the Settings button at the top of the screen.

At the top of the trip settings, there will be a Visibility setting. Set that to Hidden!
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Now just click on Save Changes.

You can also tell if a trip is Visible or Hidden by the eye symbol next to the trip name on the Trips page. An eye will tell you that a trip is visible and an eye with a slash through it will tell you that the trip is hidden.