If you open the Task Manager, (Ctrl + Alt + Del), and find there are no menu options or tabs then you may have inadvertently set it that way. You may have set the TM to “Tiny Footprint Mode.”
You can do this by clicking the empty space around the tabs. To switch back to the normal view, where you can see the menu options and tabs, click the very top border of the window. Resize the window to your desired size. Done.