You can not change the profile picture from the xbox app , if you want to replace the profile picture, You need to enter to xbox official website from www.xbox.com and sign-in with your xbox account.
After you sign-in, click on the profile icon in the top site section and click “xbox profile”
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When you enter to the xbox profile click on the Customize button.
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And then click Change gamerpic.
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Then choose your favorite icon from the library and click ok.
And that is it , the profile picture shows in the xbox app.
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