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Go to Menu
> Options Dialog 
> Grid Labels to open the grid label options.
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Select Display Grid Line Labels and Display Grid Line Dimensions.
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Select Apply and Close.
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Using the System Hierarchy Explorer
or the graphic view, select a coordinate system that has grid planes on each axis
(x, y, and z).
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Right-click the selected coordinate system and select Show Labels
from the context menu to display the grid line dimensions.
Use Select Interactively 
from the Precision Input ribbon to select a coordinate system. This defines the selected coordinate system
as the Active Coordinate System and automatically displays the grid line dimensions. If you use this method, you
do not need to perform step 5.
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Display Grid Line Labels must be selected on the Menu
> Options Dialog > Grid Labels tab. Otherwise, the selected coordinate system's context menu will not display the Show Labels command.
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Selecting Show Labels
from the context menu displays the grid line labels and grid line dimensions.
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The Show Labels
command switches to the Hide Labels 
command when you select it. Right-click the coordinate system and select Hide Labels from the context menu to stop showing grid line labels and grid line dimensions.
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Press the keyboard shortcut CTRL + L to show or hide the grid line dimensions for the active coordinate system selected using Precision Input > Select Interactively
.
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