To specify a separator between an index entry and its page number, you can add the \e switch to the INDEX field code. For example, { INDEX \e " " } adds a space. You can also make use of a tab character (but don't forget to add a tab stop for the appropriate Index style).

To show/hide field codes, press Alt+F9. Make the desired changes, and use F9 to update the INDEX field.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional