There is an entry in Package.appxmanifest indicating which device families your application is targeting. Unfortunately, it does not appear in the editor, so you will need to edit the XML directly. This is the entry you need to change:
<Dependencies> <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.0.0" MaxVersionTested="10.0.0.0" /> </Dependencies>
Replace Windows.Universal with Windows.Mobile . See the help documentation for more details.
In addition, when you are preparing a presentation for the store, you can choose which device families you want your application to be available for:

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