Gantt Timescale Settings not being shared

I am the Admin of a project and I have updated my gantt settings to show Quarters and Months. I've shared this file with others in my org, but no one else sees the new, updated settings. I saved, and they refreshed, and they don't see the updates. I even tried deleting their access and re-granting, but that didn't work either.

Why is this setting not being shared? Can someone help please?

TIA

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