This may be a known bug (or set of bugs) but I don’t see it clearly shown as such anywhere.
View > Binder Affects setting misbehaves.
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The Binder Affects setting is not saved across Scrivener invocations. I usually set this to Top Editor. It always comes up Current Editor. This means you must manually reset this each time you start Scrivener.
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The Binder Affects setting changes seemingly randomly while working. I usually set this to Top Editor. Some sequence of events will make it change back to Current Editor.
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The labels, Top/Bottom, Left/Right, First/Second do not accurately follow the layout. It appears to require a click in an editor to make the labels present properly.