If you are using the Mendix Cloud you can find the full documentation on how to do this here.
https://docs.mendix.com/developerportal/deploy/custom-domains
My query is simple, renaming URL from
https://bizcasefx0-accp.apps.ap-2a.mendixcloud.com
to
https://assessfx0-accp.apps.ap-2a.mendixcloud.com
How to go about it?