* Mutate the given item recursively to: * - change reorderEnabled (false if isMobile, otherwise true) * - change rows to columns (if isMobile, otherwise no change) * * I don't know what it's necessary to change reorderEnabled on a per-item * basis. Should be able to just do currLayout.settings.
(item: DeepMutable<ResolvedRootItemConfig>, isMobile: boolean)
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