Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
What are you seeing on your Mac ? Is your current application set to full screen now ?
First make sure the current application is not in Full Screen mode. Press Command, Control and F at same time and this will turn off full screen mode and return to normal mode. Pressing these keys will put it to full screen mode again.
Please let me know if that didn't work, so I will continue to help you
How is it going ?