2] Restart VS Code. If IntelliSense is not working as it should on your Windows 11/10 PC, you can try restarting VS Code and this should solve the issue.

Read: IntelliSense not working in VS Code 3] Reinstall C/C++. Maybe when installing C/C++ you have made some mistakes due to which Intellisense is unable to pick up libraries. In that case, we are ...