I want to comply with 1.1.
Where in my project can I set it to en-us only? When I look at the package.storeassociation.xml file, multiple languages are set to InMinimumRequirementSet="true"
Hello,
Go to the file named "Package.appxmanifest" in your Solution Explorer. There you'll find an input field named "Default Language", and set it to whatever you want (en-US), if it's not already en-US by default, as it is here.