>Is there a way to set the display of UT?
>RIght now the section in the middle - is too narrow, the section on the left and right are too wide. This results that I cannot read the messages without using the horizontal scrollbar. There is however an option to adjust the sizes of the panels which makes it possible to read without the scrollbar. I would like to set these panelwidths as my own preferable widths, is that possible and if so how?

Yes, in the top right Message view setup, there is a setting for Message area width.

In the Account page, at http://www.levelextreme.com/DataEntryMemberUpdate.aspx, you can adjust various settings in Settings section.