Sorry that the menu bar in Photoshop is not showing up.
Would you mind sharing the version of Photoshop you're using along with your computer's OS?
Try pressing the F key. You probably pressed it by mistake at some point, which would put you into one of the Full Screen modes.
If that does not help, Try resetting the Photoshop preferences. Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) as you start Photoshop. You are prompted to delete the current settings. The new preferences files are created the next time you start Photoshop. For details, see: https://helpx.adobe.com/au/photoshop/using/preferences.html