Hello @wojcika,
@James makes an excellent point that the People page can be a valuable resource for information to instructors. You could develop a script to make the Tabs API call multiple times to disable it in all courses, or you could use a tool like Postman Runner to repeat the API call for you. Even if you still want it fully hidden, it would be good to also use this API to ensure it is fully hidden from students even if the theme customizations don't load.
If you do still want to hide it fully from everyone, here is some CSS that could hide it from the settings page too. I think the id number is the same for everyone, but you may want to test this to confirm:
ul.nav_list li#nav_edit_tab_id_6 {
display: none;
}
Also, make sure you are checking the mobile view of Canvas on desktop since the way the navigation menu shows and loads in mobile view (small browser window width) changes. Only hiding the "a.people" won't hide it from the mobile view course navigation menu.
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