Windows 10: cannot set default to email app downloaded from the Windows Store

[Windows 10]

I want to use an email app I downloaded from the Windows Store, but I cannot get the default to change to this new app. I have gone online and found many suggestions of how to change the default but none of the examples line up with what I am seeing. The only choices I see are several browser and the option to go to the Windows Store, but when I get to the Store, there is no way to attach the new mail app to the default. I am using Chrome as my default browser ... I do NOT like Edge.Signed,"Pulling my hair out ..."

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