Reason
This issue is often related to the issues with receiving or processing player input and applying it to the character rotation. As there might be multiple possible sources of the problem, this page will provide solutios to the most common cases.Solution 1

Input Config asset.
Solution 2
It is possible that the player input is properly processed by the system, but scaled down by the sensitivity value. To fix this make sure to add a float input property to the config: