Looking for something on my computer - where could that have disappeared?

I have an Acer Aspire laptop here and a short time ago I had an icon in the system tray, which allows me to filter out the blue in the screen, which should spare the eyes. This symbol has now strangely disappeared and I can't find this function anymore. Can you please tell me please, where I have to search or where I have the function?

In windows this should be the night mode. Where this can be found on other operating systems, I do not know.

Right mouse button on the desktop press, there you have then under the item Settings also "Display", there look.

The night mode of Win10 has already been mentioned.

Alternatively, you can use the tool f.lux, which runs on other versions of Windows:

https://www.heise.de/....lux-62982

https://justgetflux.com/

There are also versions for Linux, macOS, Android and iOS.

https://de.answers.acer.com/app/answers/detail/a_id/35311/session/L2F2LzEvdGltZS8xNTYwMTYxODA2L2dlbi8xNTYwMTYxODA2L3NpZC9mVTdrZlFmSVV0N0QlN0VSY3BDN2d5Zl9zbHVIZHpTaFM0Y2tYWGFYeHdNY2Y3RHNycGE5YzJ2d1VzSEw0RVVPZUhDZUY4d2tSTWN5T2pVQ1NPRmt0YWlYc2ZBRDMzbSU3RXVnN0FnOXlaV2xuZ3JaRG84Rm5fWmZQOGV3JTIxJTIx

(I was looking for that…)