Amazon it's not adjustable but this way fastened into the center of the backseat she can put her nose out the window but not much else.

Look for ShadeSox (that brand actually sucks, cheap and thin... magnetix or something like that is WAY better). Amazon has tons of options but make sure you look at sizes because the ones that fit my ford focus definitely did not fit my honeys dodge durango lol. Those are really helpful with making a "barrier" that the dog wouldn't go through and we could leave the windows down. It also helped with keeping condensation down at night because we could leave the windows cracked without bugs or anything else. Never once had an issue. Also seat belt leashes!! I forgot how big of a difference those made when I was nervous he would jump out the window still. My mom has a 65+ lb mutt (German shep, white Swiss shep, boxer, Rottweiler, chow chow 😅😅😅 thank you DNA test) and this is the one she has used since big boy was 10lbs....

Mogoko Chew Proof Dog Car Seatbelt Safety Restraint Pet No-Chew Tether Cable Stainless Steel Dog Leash Puppy Vehicle Seat Belt Strap with Double Clip and Latch Attachment (S" Size,24 inch) https://www.amazon.com/dp/B07B2RWDWD/ref=cm_sw_r_apan_i_FEWSM001575QSZ7P111P