This is a very important question! Glad you are thinking about how you would like your employer to reflect values you personally uphold. This is of course different for everyone, but when looking at a company's website that you are interested in pursuing employment for, there are some key terms you can look for to see where they explain their values. These will usually be included on a company website's career posting page. For example, if you search for something like "Microsoft careers," it will pull up the landing page where you can apply, but also provide a summary of reasons why this particular company is a great place to work.
After finding where a company's values are described, the rest will be up to you to decide. For me personally, I look for companies that have Corporate Responsibility initiatives that I align with. This term is often used to describe the volunteer initiatives and social issues a company aligns itself with to give back to the community in which it operates. For example, a company could describe the actions it is accomplishing to help its community recover from national disasters, assist in fighting hunger and homelessness issues, making efforts to improve the environment, etc. I like to see that the company I am working for is making an effort to improve the surrounding community. I additionally look for other things on the career landing page that describe how a company values its employees. This includes looking at the benefits they provide to employees (like healthcare, vacation time, etc.), opportunity for career growth and adaptability, and an overall investment in my personal development in my career by describing the priority it upholds to ensure its employees feel supported in communicating their career goals and how it aligns with the job you currently have. This is important to know you feel supported by your employer in exploring the many options you have even within your own company to make sure your skill set aligns with your job!
In short, look for places where you feel, at the end of the day, you are supported in finding what you want and that the values of the company reflect the values you personally show to your own peers.