I believe there used to be a preference but it’s gone and searching hasn’t offered any hints on where to change it now.
There’s a page someone made with most, if not all, OmniFocus 2 hidden preferences.
From that page:
CHANGE THE PROJECT HIERARCHY SEPARATOR CHARACTER
If you’re using folders, OmniFocus will show the complete path in the project selection drop-down list using a colon as the hierarchy separation character, e.g. Personal : Finance. You can configure the character used to separate the project hierarchy with the URL:
omnifocus:///change-setting?OFMNamedObjectHierarchicalNameSeparator=%20:%20
Note that %20 is the code for a space).
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Great! that did it. Thank you.
Cool link! Thank you for posting, I haven’t seen that before.