Manjaro darkens monitor's screen when I focus my mouse in the another monitor

[ubermensch]

I do not know what is happening on my Manjaro KDE, but when I focus in another monitor my another one darkens,

I do not know how to fix it, someone could help me?

[Chrysostomus]

I do not know kde, but could be a compositing effect? You can test by turning off compositing. If that works, you know that it is solved by adjusting the effect settings.

[mbb]

Check if you have selected the effect to “Darken inactive windows” and deselect it.

[ubermensch]

The solution was unchecked “Allow application to block compositing” in Compositor section.