There are 2 ways:
(I) In your Projects' Tab
1. Navigate to the Projects' Tab.
2. Long-press the Project and press 'Content Call'.
(II) In your Project
1. Go to your Project.
2. Press the hamburger menu on the top-right corner of the screen.
3. Press 'Content Call'
Note: During a Content Call, participants can independently navigate through the shared file or project. If the presenter wants everyone to see the same view, they can enable Sync mode to align all participants' screens.
To enable Sync mode, tap the 'Sync' button located next to the call timer. Once enabled, all participants will see the exact view you're seeing.