It seems that you are still using the Unyson page builder and that is keeping you from disabling it. For now you can just keep Unyson framework active and if in the future you will rebuild it with the WPBakery page builder, then you will be able to fully disable it.
It seems that you will need to manually recreate it.
Most of the Unyson page builder elements are copied to the WPBakery page builder, so you should be able to find the exact elements and copy their options manually.