The Inbox is a built-in perspective designed to catch new tasks that you’ve entered into OmniFocus, prior to processing them into projects, actions, and groups. Once an item becomes a project or action, it’s moved out of the inbox at the next clean up.
The criteria OmniFocus uses to determine which items are processed out of your Inbox is a configurable preference in OmniFocus for Mac. To change this preference, go to OmniFocus ▸ Preferences ▸ Organization, and select one of the options in the Clean up inbox items which have: menu. If you sync with the iOS editions of OmniFocus, whichever preference you pick here will sync over to your iPhone and iPad.
If you’re only using an iPhone or iPad, you can modify this preference using the following links. Using the iOS device where OmniFocus is installed, tap one of the options below to change your default processing settings.
Clean up inbox items which have: