do you see any error message in your browsers console? any failing request in the network tools?
Ensure that you are setting the baseHref correctly. This can be done by setting the homepage attribute within your package.json as described here: How to host a react application on Cumulocity IoT - #7 by Tristan_Bastian
Hi Tristan, Thanks for your reply. Unfortunately it does not show me any error. Only the Material UI button I am not able to see in Cumulocity which I see locally.