Hi, @DaisyTian-1203
Welcome to Microsoft Q&A!
I select UserControl
in the WPF project, press F1, and the browser navigates to the relevant document.
Please click Tools->Options->Environment->Web Browser->Internet Explorer Options to check whether the URLs of Home Page and Search Page have been modified.
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Update:
You can try to open the help page with other browsers to detect whether the issue exists.
Sincerely,
Peng
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