The following is a colossal issue, and a MASSIVE oversight by Mojang/Microsoft. It needs to be fixed IMMEDIATELY as it pertains to one of the major limited-time Bedrock Edition events:

In the Eerie Mojang Office Party, there is no way to exit any menus, including the Sticker Book or Daily Challenge Menus or others in iOS.

On Bedrock for Windows users, it is possible to exit any menus by pressing [esc].
On Pocket Edition for Android, it is possible to exit any menus by either sliding from right to left, or in 3 button mode to click the back button on the device.
On Pocket Edition for Amazon devices, the setup is extremely similar to the Android setup.

On Pocket Edition for iOS, however, there is no built-in functionality for a "back button" or anything similar to it. Therefore, Mojang's lack of any back or exit buttons for the update make it extremely easy to softlock and literally unplayable. The only way to exit any menu appears to be exiting the app entirely, since you also cannot access the server menu (allowing you to access settings, exit the server, etc.)
On the attached image you can also see the lack of a back or exit button, or simple "X". The info button does nothing, by the way.

This is a colossal issue, and is a MASSIVE oversight by Mojang/Microsoft. It needs to be fixed IMMEDIATELY because it limits time-sensitive access to major rewards in the event which affect other cosmetic aspects of the game, such as any or all of the following: skins, capes, wearables, etc.