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Hi @kiriecshkz ,
Welcome to Microsoft Q&A!
Your IntelliSense stopped working, could you describe your issue in details? Or did you have any error messages?
Please update your VS to the latest version and create a new project to verify if the IntelliSense works or not.
You can try to reset the vs settings by simply going over to Tools > Import and Export settings > Reset all settings.
Meanwhile, repair your VS through Visual Studio Installer > More > Repair and check if it works for you.
Sincerely,
Anna
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