CheckBox.Size Property (Word)
Returns or sets the size of a check box, in points. Read/write Single.
Syntax
expression .Size
expression A variable that represents a CheckBox object.
Example
This example sets the size of the check box named "Check1" in the active document to 14 points and then sets the check box as selected.
With ActiveDocument.FormFields("Check1").CheckBox
.AutoSize = False
.Size = 14
.Value = True
End With