The two things against the wall are for the front side windows to blind.
The big drape is for blinding the front windscreen.
Best thing would be to buy a 3 in 1 piece blind to put on the outside of the van, covering front and side screens.
Some others will give you names and links for that.
I can't because I use the blinds from the A-pillars and the side window blinds.
You must have the Transporter/Caravelle dashboard if I am not mistaken? Otherwise, with the Multivan dash, you wouldn't have the big drape for the front windscreen.