[DerekM]

I'm sorry this confused you. That column is the main column that controls the outline structure. If you deleted that, you would no longer have the handles (bullets, checkboxes, triangles). That's how you can visually see which column it is if you've moved them around. There's currently not a way through the UI to change which column has the handles so you're not allowed delete it.

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Derek M.
Support Engineer
The Omni Group