Maybe you're in Full Screen mode.

Can you still see the worksheet menu bar and the View Dropdown?

If yes, then try
View|click Full screen (it's a toggle)

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Or maybe the title bar is just off the viewable screen.
try this:
alt-space bar
then hit M (for Move)

then use the arrow keys on the keyboard to move the window.

When you're happy, hit the enter key to anchor it.

Joyce wrote:

I totally lost the title bar (the blue bar at the top). How do I restore
this so I can minimize and close the program with these icons again?

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Dave Peterson