I am looking at the project drop-down menu and I see the message "Requires Business plan". Why am I seeing this?

The feature that this tool-tip is referencing is called Cross Project Visibility.
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This feature allows you to view events from multiple projects in any of our dashboard views.

If you require a Business plan trial to try this feature please contact us here: https://sentry.zendesk.com/hc/en-us/requests/new