As admin, enable "Mobile services": Plugins ► Web Services ► Mobile Create a WS Token for one user on the site: Click on Site administration ► Plugins ► Web services ► Manage tokens Go to Site administration ►Mobile app ►Mobile features - Disabled features option Select the "Dark mode" option Open a terminal/console and execute the following command: You need to replace the wstoken with the token created in step 2 and the URL of your moodle instance curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'wsfunction=tool_mobile_get_config&wstoken=3af67232a7596ceb658df4db329e5ad6&section=mobileapp' | python -m "json.tool" Check that in the WS response, in the tool_mobile_disabledfeatures value field, you see the following value "NoDelegate_DarkMode" Now, go back to Site administration ►Mobile app ►Mobile features - Disabled features option, and unselect all the options Execute the CURL request again and check that the tool_mobile_disabledfeatures value is empty