Where did the "Plan of the Week" column dissapear? (Windows desktop, Firefox)

Hello, 
after reporting my difficulties with the new layout its getting even worse. 
Today the whole "Plan of the Week" column is gone to Nirvana. 
7 days of the week are visible in the "Planner" view.
Did I miss some click button to show + hide the "Plan of the Week" column?
(Firefox)
Cheers
Frank