How do you utilize the screen tip feature?
double-click the cursor on a command
highlight a cell and hold control and b together
hover the mouse over the command
type a phrase into the "tell me" text box

Screen tip feature can be utilized when you hover the mouse over the command.

Explanation:

The features that is incorporated in the Word window is Quick Access toolbar. This appears at the window's top and contains shortcuts for those commands that are mostly used in common such as undo. save,redo. When you need of adding or removing any shortcuts then Customize Quick Access Toolbar icon  must be selected. It contains many thing in which Screen Tips is among them.

When the user hovers mouse over a command on the Ribbon then, the small boxes that pop ups are called screen tips. It helps in displaying details about any feature you are interested in. It also helps with information related to the shortcuts in keyboards that are used for the feature execution without the removal of hands from keyboards.

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