Data preferences
To get to the Data preferences, just choose Preferences from the OmniFocus menu, then click the Data icon.
The Clean Up section of the Data preferences controls exactly how items should be handled when you perform a Clean Up. You may want to require that an inbox item has A Project, A Context, Both, or Either before it is automatically moved out of the inbox.
If you process items with a project but no context, they move into the appropriate project but also appear in the No Context group of context mode so that you can assign them a context at some point.
If you process items with a context but no project, they move into the Default List for Single Actions as indicated below; you can choose a single-action list for holding your projectless actions, or let OmniFocus create a “Miscellaneous” list when it’s needed.
You can also choose whether Clean Up completed Inbox items. If you want OmniFocus to file away inbox items you’ve marked complete, regardless of whether they have a project or context, turn this setting on. If you still want to go back and assign projects or contexts to your completed inbox items, so that they get filed away in the right place, turn this off.
In the Dates & Times section, you can control how OmniFocus handles time-related stuff. The Mark actions due “soon” setting controls how long before an item’s due date it should start appearing in the special style for almost-due items. By default, items start turning orange 2 days before they are due.
The Show Due Soon and Overdue actions setting determines whether you should see colored counters next to items in the sidebar, a colored counter in the menu bar, or a colored badge on the OmniFocus Dock icon. If you choose to show an indicator in the menu bar, you can click it to see how many due soon or overdue items you have in your inbox and your individual contexts; choose an item from this menu to open an OmniFocus window on it.
You can set the review interval for new projects; by default each project is to be reviewed every week.
Below that, you can choose which day is considered the start of the week, for the purposes of entering dates like “next week”. If you choose Default, the week starts on whichever day is normal for the region chosen in the International System Preferences pane.
The Default Time for Due Dates setting controls the time of day assigned to due dates that you enter without specifying a time, as described in the Setting start dates and due dates section of the help.
The settings in the Projects & Action Groups section determines whether newly created projects and groups should be parallel or sequential and, upon completion of all their actions, if a project or group should also be marked completed.