An update to the above post, When downloading a file from the server (Asus desktop running LM 20.2 xfce) to the client (Acer Aspire running LM 19.3 xfce) the file explorer window has full text display and appears as standard Thunar.
I’ve not had time to prepare and send the logs as requested but I have found a workaround but clicking 3 boxes in the advanced video settings as shown in the attachment.