This is kind of weird, but sometimes when QTP is run from Quality Center, it disables these view tabs. I don't know why, I guess it's an undocumented feature.

Anyway, you'll also see that the option to select them in the View menu is also greyed out and disabled. To get it back, you need to go to Tools > Options and then on the General tab, check the box for ''Display the Keyword View for tests and scripted components''. This should re-enable the options in the View menu and bring the tabs back. You'll have to reopen your test or open a new test before it will take affect, though, so be sure to save what you are doing!