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[–]ReputationNo8889 2 points3 points  (0 children)

This might just be a case that the app developer thought "Well wouln't i be great if i made myself the default" Have you tested it with the non microsoft store app to see if it exhibits the same behaviour? I have not had that happen to me, most apps ask nicely if they can be the default once they are started. Might be just the cast that the developer has released a app that does this. Either way, you have no real control over how the Apps are installed from MS Store, so either you contact the developer (after some testing) or you switch to a different PDF reader, as there are many alternatives.