To enable the feature, go to Me > Security &
Privacy > Chat & Call Privacy, and turn on
Block Screenshot for Calls.
Once enabled, both call parties won't be
able to take screenshots or record the screen.
Note:
1. To take screenshots or record the screen
in a call, both call parties must disable
the feature.
2. The feature is currently not available on
iOS.
3. If you still can't take screenshots or
record the screen after both you and the
other call participant have disabled the
feature, submit your feedback in Feedback
Center and turn on "Upload Log".