To show/hide field codes (if that is what you are asking), press Alt+F9.

On the other hand, if you are asking about updating fields, you can select them and press F9. Alternatively, you can switch to Print Preview and then close it (you can use Ctrl+F2 followed by ESC). That triggers an update of many fields and you don't have to select them first.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional