TSS XP allows you to customize what fields you view and the order in which they are displayed

Ideally you want it to look something like the attached image below, but nothing is perfect and sometimes there are just too many columns on the screen to read any of the columns and it doesn't seem to let you remove the columns to fix the problem

there is a fix for this issue see below

Usually this happens in the browsing invoices screen but it will show the entire window with all the columns and you can't resize any of the columns 

To allow you to reconfigure this view or fix this problem do the following

go to Tools menu then Options and choose Reset Browse Customizations 

Then Click Yes to the dialog box that shows up seen below

after doing this you may have to close and reopen the view

and  then click on the column headings and choose the field chooser to readd or reconfigure the columns in the order you want to suit your preferences.