I’m just starting my first C project and I don’t know why, but the #include <stdio.h> line has a red line under and also the name of the file turn red, even if the code run correctly when I try to run it

I would like to undestrand why it turn red, what is the problem,

here’s a link to a video that show the problem https://youtu.be/5LLHdmnYD8w