Use the Grid to place shapes precisely on a page.
Show or hide the grid
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Go to View, and select the Grid check box to show the grid.
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Go to View, and clear the Grid check box to hide the grid.
Work with a variable grid
A variable grid, which shows more precise gridlines at higher magnifications, is helpful in most drawings.
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Select View > More.
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In the Ruler & Grid box, select Fine, Normal, or Coarse for Grid spacing Horizontal and Grid spacing Vertical.
Note: Fine is the smallest grid spacing, and Coarse is the largest.
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Select OK.
Work with a fixed grid
A fixed grid shows the same spacing regardless of the magnification.
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Select View > More.
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In the Ruler & Grid box, select Fixed for Grid spacing Horizontal and Grid spacing Vertical.
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Type the spacing you want between gridlines in Minimum spacing.
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Select OK.
Source: Microsoft