Thank you for the help via e-mail about clarifying that JSON Forms being able to use different design language such as Bootstrap,Ant Design and, etc. For a follow up question, I wanted to know how to use different UI library for different components/looks, say Ant Design, in replacement of the defaulted UI library, Material UI, for the forms?
JSON Forms core is completely independent of any UI framework. We provide renderer sets for example based on react & ui-material which are then used to actually render the ui schema elements.