Thread: Task Numbering
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There isn't a way to hide the task numbering, but this is a popular feature request in our database that we're looking into. Two time-scales will be implemented in the next update to OmniPlan.

As for the MPP task ID, if the file contains the MS Project UID field during import, OmniPlan users those IDs. You can view them by going to "View" > "View Options" and checking the "Unique ID" box.