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Available on the market are panels that limit the viewing angle of your laptop, smartphone or other screen, which, of course, would be a very handy physical security/privacy solution if you’re working in an open space. I’ve recently bought an upscreen Spy Shield Clear, which costed just under £40. The vendor also has screens for a very large range of smartphones and laptops, which cost under £10.

One side of the screen is coated with pretty strong adhesive, much stronger than what you get with the average phone screen protector. Of course, it’s tricky to remove and refix if you get air bubbles, but it means it’s not coming off accidentally. I managed to get the screen attached properly after several attempts without damaging the screen or weakening the adhesive.
In the mounting kit, there are alignment stickers for aligning things, a microfibre cloth and alcohol wipe for making sure the surface is totally clean, and a plastic card for smoothing out bubbles as the screen’s applied.

Does the shield work? Yes, if you’re using applications with a dark colour scheme, and if the screen brightness is set very low (as mine always is), and if there’s a lot of ambient light. Basically it’s very effective in an office environment when using something like Visual Studio Code. Effectiveness varies in other cases – if the screen brightness is set to 80% – 100% in lower light conditions, the screen is still visible from even 90%. I noticed the faint lines running through the material also has the effect of making text unreadable outside an angle of about 30 degrees.