Intellisense features are not working on my codes

[svidalCCTVal]

C/C++ navigation features (Ctrl+Click, F12, Go to Definition) stopped working globally in PlatformIO / VS Code

I have different PlatformIO projects for Arduino. I used to rely heavily on the features provided by the C/C++ extension. From one day to another, the features I use the most just stopped working.

For example, Ctrl + Click to access the definition of a function or variable no longer works. Neither does F12 or anything else I've tried. I have already uninstalled and reinstalled the C/C++ extension, VS Code itself, and the PlatformIO extension, but nothing changes. The syntax highlighting works as expected, but no navigation or code intelligence features are working.

I've already followed all the troubleshooting steps from this GitHub issue, every tutorial I could find on Google, as well as prompts with Gemini and the VS Code AI agent.

Does anyone have any idea what could be going on?

Here is a screenshot of a brand new PlatformIO project, with no modifications, created in a fresh folder with nothing else:

As you can see, right-clicking on myFunction() doesn't even show the "Go to definition" option.

Please help :(

(Note: I recently installed and then uninstalled the STM32 extension for VS Code, which created some config files, but the issue persists even after completely removing it and testing with fresh, unrelated Arduino/PlatformIO projects).

[svidalCCTVal]

I feel very stupid, but I solved the problem 1 minute after posting the thread: IntelliSense Engine was disabled in the VS Code settings menu. I don't know why or how it got disabled, because I never mess with VS Code settings.

Either way, I hope this can be useful for someone. Feel free to roast me. Bye.