It would be nice to have a focus mode (Hoist/Unhoist).
In the menu system:
Outline > Focus In (⌥⌘→)
Outline > Focus Out (⌥⌘←)
For iOS options (applications which edit OPML, or display HTML), see:
What can I use to open / edit Bike files on iOS/iPad? - Bike - Hog Bay Software Support
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