If Developer tab in Microsoft Office is missing, you can add Developer tab in Word, Excel, etc. via Settings, Group Policy, Registry Editor.

If opening the Developer tab and clicking a button is a little too much work, you can also open the editor with the keyboard shortcut Alt+F11, which works whether the Developer tab is enabled or not.

If you find that there's no Design tab in Microsoft Word, verify if the Design tab is enabled in Word Options under Customize Ribbon.