Can't run one File in IntelliJ

Hey Guys,

So I'm switching over from Eclipse to IntelliJ, and in eclipse i'm able to do this https://imgur.com/a/sWz4JX7 , but when I try to do the same thing in IntelliJ like here https://imgur.com/a/rQn6gzd  or here https://imgur.com/a/UznjK8s .

Is there anything I can do to make it run just that one file?

Thanks