I don't use that factory curtain for four reasons.
1 - It's ugly.
2 - I got a thick one that goes outside the vehicle and also acts as an insulator. Has anti-theft tabs.
Clicky3 - I made a curtain that goes between the cab and cabin. It helps with heat loss, and we can put the cat's litter box behind the curtain and out of the way. The cabin might "feel" a little less roomy but we don't use the cab space while we're set up anyway. The curtain slides open when we're driving.
Details and pics4 - The factory one is still ugly.