It is very difficult to adress the vertikal and horizontal bars at the margins of the preview box with the mouse, because they are very narrow.
So it would be nice if they could become broaden a little bit.
Another subject is the on-screen-display of the “email deleted” message.
The time of beeing displayed is very long, about 4 to 5 seconds, in the meanwhile it’s covering the lower part of the message-list.
To adjust your “bars” you can use the inbuilt Theme Editor.
Menu-> Tools ->Theme Editor
(dependant upon your system speed capability this can take a while to load so be patient)
In the Theme Editor->Select Scrollbar->UseSystemScrollbar and select this
Save, then exit eMC restart eMC
+++++ +++++ +++++ +++++
To adjust length of time “email deleted” message is displayed.
Menu-> Settings-> General-> Notifications ->Hide popup window after  milliseconds Save & Close
If this does not help it is your system speed capability.
¡Los mejores deseos desde Valencia y mantente a salvo!