iOS Keyboard extension disable for other application on iPhone - ios

I have developed the custom keyboard in the iOS with the help of Keyboard extension provided by the Xcode. This keyboard installed on the iPhone with containing sample app and it's get added as iOS level. This keyboard is available to use across all the application in the iPhone.
Can i restrict the use of custom keyboard to my application only? I don't want keyboard to be expose to other applications in iPhone.

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The problem now is that users use Alt-Tab to switch back to the home screen of the iPad and then use the iPad for personal stuff. The owner of the gym needs me to disable Alt-Tab while in the app.
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Xamarin App Keyboard is a different size to iOS Keyboard

I'm developing an iOS app in Xamarin (not using Forms, using Xamarin.iOS) and I have noticed that the keyboard which appears in my Xamarin built app is larger than Keyboards which appear in other apps.
E.G. My app
E.G. Other iOS app (Apple Notes)
The numbers aren't really important, what is important is that there is definitely a difference in size between the two keyboards in terms of key height and key spacing.
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I would like to get my Keyboard to be the same size as a normal iOS App Keyboard.
EDIT
Krumelur's answer is correct.
This is how I specified the launch screens
https://stackoverflow.com/a/25960203/807836
In Visual Studio, there does appear to be an issue with this XML entry being lost if you edit the project file through the IDE.
This is not Xamarin related. Your app is running in compatibility mode on an iPhone5 or 6. You will have to provide a launch screen for the particular device or a launch image to let iOS know you support the bigger screen.
See here on how to use launch screens.

Is there a way to test if a keyboard extension has been installed in iOS?

I'm creating a custom keyboard extension in iOS 8 using Swift, and I was hoping to be able to modify the home screen of the app based on whether the user has already installed the keyboard onto their device.
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Unable to select my custom keyboard from the available keyboards list

I'm developing a custom keyboard app for iOS devices. After adding keyboard extension to my app I added a TextView to Main.storyboard and then I ran my app on an iPhone 5 simulator.
For adding my custom keyboard to available keyboards list I went to Settings > General > Keyboards > Add new Keyboard & here I added my custom keyboard but when I'm returning back to my app and trying to select my custom keyboard by long pressing the globe icon, my custom keyboard has not been shown there.
What's the matter here?
Please reply & I'm sorry for no code as I haven't coded any yet.
Thanks in advance
Please neglect the mistakes!
There is a bug concerning the simulator.
Either you run your extension on a real device or you can use the Photo app or Safari browser of the simulator to test your extension.
general article about developing iOS keyboards (head for “The Simulator”)
As of Xcode 6.1, you can no longer open 3rd party keyboards in most apps in the Simulator, including your own. (And not just 3rd party keyboards: most system keyboards refuse to show up, too.) Not only does this make debugging a whole lot harder, but it also prevents you from easily making screenshots of your keyboard if you don’t own some of the newer devices. This issue is marked as a bug in Radar, and seeing as how it first appeared in the Xcode 6.1 betas, I cannot fathom how it got through to release.

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