iOS, Android and UWP sandboxes for native apps are always enabled, there isn't any configuration for naive user available.
You just allow or not the access to specific actions and that's it.
On UWP you cannot even access files directly, the user has to select them for your application.
You can only change the way sandboxes behave via developer settings, but that is only in the context of debugging, which naive users will never do anyway.
iOS, Android and UWP sandboxes for native apps are always enabled, there isn't any configuration for naive user available.
You just allow or not the access to specific actions and that's it.
On UWP you cannot even access files directly, the user has to select them for your application.
You can only change the way sandboxes behave via developer settings, but that is only in the context of debugging, which naive users will never do anyway.