I open a file in Word. No tab along the top is active. On the far left, "File" is in dark blue but no tab is active. So, for no tab are the various commands and functions visible. So, I click on Home. When it becomes active I can see all of the many functions under Home across the screen just below "File, Home, Insert, Design, etc." When I click somewhere in the body of the word document all of those Home functions disappear. We're back to where we started when I first opened the file. Now, if I click on "Home" the tab becomes active again and I can see all of the Home functions. But they will not stick with me.

The same thing happens when I leave Word and return. For example, when I click on my browser icon to write this message and a then click on the Word icon to return to word, Home has become inactive.