Quick access toolbar is situated on the top of the Word window.
A few functions are already saved by default.
You can save any function In the Quick Access Toolbar.
Right-click on any icon from the toolbar and choose Customize Quick Access Toolbar.
In the drop-down menu above you can set the filter to show you specific commands.
I chose All Commands.
In the menu select any function you want to add to the Quick Access Toolbar.
I chose Grow Font 1 Pt.
A new icon will appear in the Quick Access Toolbar.
This will allow you quicker use of the new feature.