Unfortunately, there’s no easy way to merge columns, once they’ve been created. If you paste a table (which is likely tab-separated) into OmniOutliner, OmniOutliner assumes you’d like a table!
If you’d like to fix it, you can:
- copy a row (or collection of rows)
- paste them into your favorite text editor (TextEdit is free, and built-in)
- find the tabs and replace them with space(s)
- paste that back into OmniOutliner
And you’ll have “merged” rows again.
Sorry there’s not a faster way, but if you’d like to email omnioutliner@omnigroup.com, we’d be happy to add you to the open feature request!