I use my laptop in grad school and had to buy a privacy screen. This is out of scope. The students on either side of me noticed that my computer was completely turned off! Of course, when someone is directly behind you, their effectiveness is limited, but the screen exceeded all my expectations.
Enhanced Privacy with 3M Privacy Filter for 14 Inch Widescreen Laptop - Flip-Share COMPLY Attachment, Gloss/Matte Reversible, Blue Light Reduction, Screen Protection, 16:9 Aspect Ratio (PF140W9B)
10 Review
ποΈ Enhanced Eye Protection: 2 Pack 13.3" Laptop Screen Protector - Blue Light Filter, Anti Glare & Blue Light Blocking Screen Protector for All 13.3" 16:9 Laptops (Diagonal Length 13.3", Bezel Not Included)
10 Review
π₯οΈ Optimized 3M Gold Privacy Filter: 13" MacBook Air (GFNAP002)
10 Review
Ovimir Diagonally Measured Computer Privacy Laptop Accessories
10 Review