The documentation states/strongly implies that there should be an ability to leave an action override in place in Salesforce Classic, whilst removing it in Lightning/Mobile:
Remove Overrides for Standard Buttons and Tab Home Pages
However, step 3 describes options which not available within our org:
Select No override (default behavior) for the experience whose override you want to remove (Salesforce Classic, Lightning Experience, or mobile).
We've had a case open with Salesforce for a few weeks now and I can't seem to make any headway (they say the documentation team say that their documentation is correct, but also can't explain why I don't see the options that the documentation says should be there)
Being able to switch off the override in LEX would be ideal. As we're in Lightning Console, using Lightning Components to override the override behaviour specifically for LEX still results in unwanted behaviours (tabs being opened unnecessarily, no access to inline editing, etc.) The only option remaining to us may be to have to re-build an object model specifically for LEX, which I'm sure isn't the desired approach when migrating to LEX
Is anybody able to confirm which is the expected behaviour?