Opening all aplications in foreground - KDE Plasma

When I open the first application, eg Firefox, the application starts in full screen (covers the desktop). When I open more applications, they all start minimized. Firefox remains in the foreground.
What can I do to make the running of subsequent applications open them not in a minimized form, but immediately in the foreground?

is this a fresh install, or when did it started to happen? also provide formated output from:
inxi -Fazy