@Rocky Mondal, Thanks for posting in Q&A.
Under iOS app protection policy settings, there's no such setting yet.
https://learn.microsoft.com/en-us/mem/intune/apps/app-protection-policy-settings-ios
The reason it is not possible with iOS is because Apple does not allow application to control the underlying IOS. You can feedback to Apple support to see if we can have this in the future.
Currently, under iOS device restriction policy, there's a setting "Block screenshots and screen recording:" which can prevent screenshots or screen captures on the whole devices. You can use this as a workaround.
https://learn.microsoft.com/en-us/mem/intune/configuration/device-restrictions-ios
Hope it can help.
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