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From the OmniOutliner 3.7 (v143.33) release notes:

- Added two new defaults to support the keyboard changes already made
in OmniFocus, OOShouldEditNotesOnEnterKey and
OOShouldToggleEditingWithEscapeKey.

The default values of these are set so there is no changed in enter
and escape key behavior over previous OO3 versions. To match
OmniFocus's enter key behavior, enter the following without the
quotes into Terminal.app while OmniOutliner is closed:

For pro - "defaults write com.omnigroup.OmniOutlinerPro3
OOShouldEditNotesOnEnterKey -bool false"
For standard: "defaults write com.omnigroup.OmniOutliner3
OOShouldEditNotesOnEnterKey -bool false"