React-Native Application configurtion

I am trying to setup react-native app hosted jitsi meet server in another server I want to change the default configuration of mobile apps
Running “App” with {“initialProps”:{“externalAPIScope”:“481a9bb6-4632-475d-93f6-88587e5e4aa5”,“flags”:{“pip.enabled”:true,“call-integration.enabled”:false,“welcomepage.enabled”:true},“timestamp”:1587933637938,“url”:{“serverURL”:“https://meet.jit.si”,“config”:{}}},“rootTag”:21}

welcomepage >> false
serverURL >> myserver.com

Please guide me how can I change the styling as well.