This concerns all the following lists:

• games on the Status page
  
• game offer list on the waiting room page
  
• users list on the Users page
  
• users list on the Contacts page
  
• running, finished and observed games list on the Games page
  
• etc.
  

To add a column select the one you want to add in the pull-down menu at the bottom of the page, and click the "Add Column" button next to it. To remove a column click on the red 'x' () next to the column header. There may be columns that are static and can't be removed.