If you make a fence from a directory and make the view for the fence 'List' it does what it is supposed to.
If you then resize your screen resolution the view for that fence changes to 'Details'.
Hope this can be fixed as I use fences a lot in list view and also have to change my resolutions quite often.
EDIT:
This is still broken in beta 2.1
I was not able to reproduce you issue as you described it. After changing the resolution, the Folder Portal kept the list view.
Please create a support ticket at support@stardock.com. Also, please download and run the following utility:
http://sd.stardock.com/SDSupportTool.exe
This is a tool that we use to gather relevant log files and basic information about your computer. Once the utility finishes running, please send back the .zip file it creates on the desktop.
Also, please reply with any screenshots that may help illustrate your issue(s).