In my case it was not showing for cpp as I accidently hid it.

Here's what you need to do.

right click on those three dots on the top right here

(Remember it's right click on three dots and not left click)

(Right click on the toolbar wont show this option, you need to do right on any of the button on the toolbar)

Then you can select the run/debug option or just simply reset the menu see here