By design, tabbing out of a formfield takes you to the next available formfield.

One wonders why you're persisting with formfields when content controls are available.

Moreover, given your other thread where you're using checkbox content controls, you should note that formfields and content controls should not be used in the same document. They weren't designed to be used that way and trying to do so is a known source of problems - especially when checkboxes are involved.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]