Deployment – Error: You can’t use the Large form factor with a Lightning component action override

Has anyone encountered this on v42.0 and if so, was there a resolution? I am overriding the “New” Case action with a Lightning component.

Strangely enough, when attempting to deploy to an org that org on API v41.0, the message is instead: objects/Case.object -- Error: Large is not a supported form factor.

In the Case.object metadata, here is the relevant action override section (you can see formFactor is indeed set to “large”:


However, a value of “large” seems to be what the documentation for the actionOverride metadata requires for a lightning component override –

the Large value represents the Lightning Experience desktop
environment and is only valid for the flexipage and lightningcomponent


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Method 1

I was testing and removing the <formFactor>Large</formfactor> line from the metadata allowed the deploy to succeed, and the override appears to be working correctly in the target org.

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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