Step 1: Show the Developer tab on the ribbon
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Right click on any of the ribbon commands. For example, right click on Home and then select Customize the Ribbon....
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Go to Main Tabs box under Customize Ribbon section on the left-hand pane.
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Select Developer on the Main Tabs box and select OK. Â
Step 2: Lock or unlock the form
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On the Developer tab, select Restrict Editing command.