Good afternoon, I have encountered such a problem. When opening the folder with the .ino file, it is not possible to configure IntelliSense, it is trivial that I cannot select a board, nothing happens at the touch of a button. Once I managed to configure IntelliSense, but when I try to open a new project, everything repeats, the project either does not compile at all or compiles, but a message appears at the bottom that the IntelliSense configuration has not been created. Tell me how to properly configure IntelliSense and your extension. Thank you.