When I hover on the opened tab, the rest of the windows get transparent and only the hovered window come into focus. How do I disable it so that windows don't get transparent on hover?

I believe you should be able to disable that in System Settings -> Desktop Effects -> All Effects, the effect is called Highlight Window. (unless it's changed since Plasma 4)

airdrik wrote:I believe you should be able to disable that in System Settings -> Desktop Effects -> All Effects, the effect is called Highlight Window. (unless it's changed since Plasma 4)

Sorry but there's no Highlight window and I tried turning off every effect but I am still getting transparent window on hover.

There's a Highlight Windows option in Task Manager Setting. That solved the problem Thanks