Reddit reviews 3M Anti-Glare Filter for 27" Widescreen Monitor (AG270W9B), Clear
We found 1 Reddit comments about 3M Anti-Glare Filter for 27" Widescreen Monitor (AG270W9B), Clear. Here are the top ones, ranked by their Reddit score.
Diffuses light so your screen is easier to see in challenging and changing indoor lighting conditions, brightly lit indoor areas and near windowsHelps reduce Mirror-Like reflections from Indoor bright lightsCompatible with curved displaysCompatible with most touchscreen displaysSatin-like Matte Surface cleans easily and hides fingerprints
You can't make it like it was from the factory, but you can remove the old stuff and then simply buy a 3M anti-glare sheet to place over the monitor.
Dismantling of your monitor should be similar to this:
https://hddcaddy.eu/remove-anti-glare-coating-from-lg-29um68-monitor/
And the replacement film you need to find is this brand, only larger to fit your screen:
https://www.amazon.com/3M-Anti-Glare-Widescreen-Monitor-AG230W9B/dp/B01HHXPB9M?th=1
If you can't find it in stores, you should be able to contact 3M directly via their website.