I’ve done this 2 ways before:
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If a player is tacet for an entire project, but needs to appear in the score, it’s easy to simply apply a “tacet” page template that doesn’t include a music frame.
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If tacet for only one flow, you can create a Paragraph Style with a white Background Color that will hide any music. In Engrave force the entire flow on to one system (I’m at 370% here), enter a bunch of spaces as Text that use the Paragraph Style you created, then apply text that creates the Tacet. Switch to Local and hide the text in the score. In the example below you can see that there are no page overrides, yet I have a tacet for Flow 3.