Because you can take a screenshot in the silence there is no need to worry about around.
In addition you can take a screenshot quickly in a variety of ways.

Shooting Methods
・Overlay Icon
It can be taken using the overlay icon that displays on the screen.

・Sensor
It can be taken by using proximity sensor light sensor and orientation sensor.

・Notification
It can be taken by using notification.

・Assist
It can be taken by swiping the Home button (long press in Android 6.0 or later).

・Shortcut
It can be taken by using the shortcut after creating a shortcut to the home app.

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Note1:
It is necessary to grant of the permission in order to take a screenshot.

Note2:
Following apps may not be able to capture.
Camera movie and etc.

Note3:
Some revisions in Android 5.1 have the potential bug in the system. Therefore "System UI" may crash at the time of shooting.
To avoid this problem please don't put a check in the "Don't show again" in the dialog that appears at the time of shooting.

Note4:
Android 8.0 or later the overlay icon cannot be displayed on the status bar due to OS specification change.