Well its now November 2020 - I've read all your replies. Since this is STILL a problem after 2 years???? Really Quickbooks. 

 It does seem to be which monitor you are on. However, this problem, of not being able to click on a figure is ridiculous that you have to be on a certain monitor.  I am in a CPA firm and normally have more than one client open at a time.  I do not think having to switch monitors is an answer in this day in age.  Quickbooks needs to correct this issue ASAP.  It is costing everyone time and money.