"NewFlyouts" can't be dismissed on mobile
On the Advanced Editor under 2.8, by default, none of the flyouts can be dismissed once they're opened on mobile devices; tapping outside the flyout has no effect.
These must be disabled manually in config.php by setting:
$Configuration['Feature']['NewFlyouts']['Enabled'] = false;
Unfortunately, with this disabled, the original flyouts no longer work properly either: layout is incorrect, and the other flyouts are actually hidden but active in the background, so tapping to dismiss a flyout frequently presses a hidden button.