My iPhone XS Max clicks the display or the back glass. Is it warranty case?
When I try to twist or slightly press the phone, I hear a creaking
We can't judge about that issue remotely, sorry.
Make an appointment at your most convenient Apple STore or Authorized Service Provider and have your device inspected. After checking it out, they'll give you alla the available options:
Apple - Find Locations - Location Selector
Regards
Giulio