Because you did not choose a department, which is Electronics in your case. Advanced features only available if you choose a department. Most of the sort option

Because you did not choose a department, which is Electronics in your case. Advanced features only available if you choose a department. Most of the sort options do not work when you choose "All"(department) . if you go to jeviz.com you will see that there is no "most reviews" sort option for all departments, so you can see what is availbale sort options from jeviz.com by selecting a department.