Word 2013 and Word 2016/2019 introduced a new window when you use "Save As". Microsoft calls this "Backstage".

For me, this extra window has absolutely now value and just means one click more. Luckily, there is a setting that removes that extra window. Here is how:

1. Click on File > Options
2. Tick Don't show Backstage when opening or saving files
3. Click OK

What is confusing is that if you go to File > Save As, you will still see the Backstage window! Unfortunately, that tick box only fixes the keyboard shortcut for saving. So if you press Ctrl-S, you will now go directly to the Save File Dialog.

If you don't want to use keyboard shortcuts or can't (because you are on a tablet), you can add the "Save As" to the Quick Access Toolbar:

1. Click the down arrow on the Quick Access Toolbar
2. Click on More Commands...
3. From the list on the left, select Save As and add it to the right list

You can now use Save As with one click: Just click on the Save As button (Floppy disk icon with a pencil on) in the Quick Access Toolbar