Sorry if this is the wrong place to ask, just recently installed EOS and figuring things out slowly.
Is this behaviour possible on the latest version of KDE Plasma? It’s something I’m somewhat used to.
Cheers.
Welcome @Kuro! 
The settings for this sort of thing are found under:
Settings > Window Management > Window Behaviour
I’m not sure if it has exactly what you’re looking for, but have a play around perhaps.
The documentation for this is here:
https://docs.kde.org/stable5/en/kwin/kcontrol/windowbehaviour/index.html
https://userbase.kde.org/System_Settings/Window_Behavior
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This is definitely the right direction and I was playing around with these, I can probably get used to some setting here, but none of them really change the action what happens when you press on the icon.
Thanks for the docs, I’ll go through them too!