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EMPLOYEE0It sounds like you're in Firefox.
If you want to try other themes, but don't like some aspect of the experience, all the controls are under that Help button if you click Settings.
If you're done with themes for now and want to fully remove, in the browser menu bar, click Tools --> Add-ons --> Extensions. Look for the Default Theme Engine - Personas Interactive and remove that.
If I've missed anything, let me know.