While Signal is much more secure with a screen lock, your data is still vulnerable to screenshots and the multitasking menu. The multitasking menu can provide snippets of your Signal data to prying eyes, while screenshots can actually compromise your privacy. Fortunately, Signal lets you disable screenshots for the app entirely. This setting also applies to multitasking examples. Let’s take a look at how to disable screenshots for Signal.

Launch Signal and tap your profile picture.

Now tap on 'Privacy'.

Under the 'App access' section, turn on the switch for 'Screen security'.