Word Menu Toolbar On iMac

Hi,

How do I get the full Word menu toolbar to display on iMac, I have to use Word for my job, it's thru Office365, and I go through Dropbox - thank you all for any suggestions. My IOS is up-to-date. It's currently displaying some things, but not all. I did try clicking the dropdown carrot on right side of screen, which took it all away, so when I click to bring back menu, is only displaying parts of it. Thank you for any feedback:)