In your specific case the problem was exacerbated by WFH. But if your boss doesn’t have a problem with making people work from 7am to 6pm, the problem is the bo

In your specific case the problem was exacerbated by WFH. But if your boss doesn’t have a problem with making people work from 7am to 6pm, the problem is the boss. They could have at any time decided to do the same thing in the office, and many offices do work that way. If you wouldn’t stay at your company if they required you to be in office 12 hours a day, why would you stay around if they require 12 hour WFH?