I have been trying to enroll students in a course using the 'Enroll Users' button under Participants. When I click on the 'Enroll Users' button, the page turns black and I have no idea why. I cannot therefore use this to enroll users. The only way I have been able to enroll users is by using the 'Enrollment methods' from the gear menu under Course administration > Users in the Administration block using the 'Enrol users' icon in the edit column opposite manual enrollment. Any idea why this is happening?
Also under Participants, I am wondering why letters under first name and surname appear vertically and not horizontally like I have seen elsewhere in Moodle 3.5 demos. I have to scroll all the way down to see the table of enrolled users. See image attached.