Legal Question in Employment Law in California

Employers are entitled to set and change hours, duties, titles, compensation, benefits, etc. Employees have the 'right' to pay and employee benefits per the law and company policy as agreed between the employer and employee. Negotiate.

In general, unless you are civil service, in a union or have a written employment contract, you are an 'at will' employee that can be disciplined or fired any time for any reason, other than illegal discrimination under the Civil Rights, or Whistle-blower, or similar statutes. Your goal should be to keep your employer happy with you.