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The QAT
To the left of the title bar, you will find the QAT. This toolbar contains, by default, the save, undo, and redo icons. You can easily add frequently used icons to the QAT by clicking on the small arrow icon that is always present at the rightmost end of the QAT, as shown:
Icons that already display a checkmark next to them indicate that the icon is already an option on the QAT. You simply have to click on the name of the shortcut that you want to add to the QAT.
You can select the More Commands… option, which opens a dialog box that allows you to search for any additional icons from the comprehensive list of Office 2019 commands. The Show Below the Ribbon option is used to change the location of the QAT to display it below the ribbon (just above the ruler bar).