This might be an issue of an extension, what you can do is disable all the extensions and then re-enable them ( https://www.reddit.com/r/vscode/comments/sdg8g9/ctrl_click_go_to_definition_not_working/) Screen shot of the comment in thread

This works mostly.

If that doesn't work, you can go to your user profile ( File> preferences > Profiles), and there you will find a settings.json file. You can remove its content, which worked in my case. The issue in my case was that an extension added the ctrl + click for multi cursor.