Why in fresh Kubuntu 20 installation hot keys do not work?

Hello,
On fresh Kubuntu 20 installation I set hot keys for some applications, like : Screenshot by Lightshot
But these hot keys do not work. I also trying several other apps with host keys but they do not work.

Are there siome more options I have to pay attention at ?

Thanks in advance!

It would be better to ask these questions at https://ubuntuforums.org/ or https://askubuntu.com/, where there’s probably a much higher chance of getting an answer.

I still have this problem.
Can it be some problem with misconfigure at System Settings → Keyboard ?
I have mostly default options, just added 1 language layout

What did the Ubuntu people have to say about the problem?

No feedback on ubuntuforums.org