moodle\user\index.php
line 213
$groupsediturl = $CFG->wwwroot . '/group/index.php?id=' . $COURSE->id; //分組頁面URL
$groupseditstring = get_string('groups');
$a = ' '.'<a href="' . $groupsediturl . '" class="btn btn-secondary" >' . $groupseditstring . '</a>';
if ($PAGE->user_allowed_editing()) { //判斷是不是可以編輯
echo html_writer::div($enrolbuttonsout . $a, 'pull-right');
}else{
echo html_writer::div($enrolbuttonsout, 'pull-right');
}