How can I remove the blank column from computers and contacts list

I know this is a mundane questions but I find it annoying. 

In the old Teamviewer computers and contacts list it used to be one column. Now its double the size with a totally blank column on the right. How can I get rid of this? Or change the view. I have tried resizing that doesn'twork it seems to be the default size of the app. I prefer just the one list with all my contacts as I like to drag it to the right side of my centre monitor.