No KDE netbook in Mageia 6 (Plasma 5.8.7)
But I found a solution to have as much useful screen space:
1. put your panel on the left edge of your screen
2.from
https://forum.kde.org/viewtopic.php?f=289&t=126631 :
the KWin behavior (no borders when windows are maximized) that Plasma netbook used, should still be available by editing kwinrc by hand:
adding
BorderlessMaximizedWindows=true
in the [Windows] section
Please notice that this key will likely be dropped at some point and replaced by a kwin script (in case you wonder that it suddenly stopped working)
You'll then be able to activate it in "kcmshell5 kwinscripts", but since it's a remote/secret feature (which actually requires additional help, eg. a window button plasmoid or so which would then toggle the setting) we will likely not expose it now to only withdraw (moved to scripts) it soon after. In systemsettings>Window Management>KWin Scripts>Get New Script: I found "No border on maximized windows" but that does not seem to work: I installed it but it did not appear in the in main script list.
But the kwinrc addition works (for now)! Of course I had to figure out how to unmaximize if the title bar border is gone: systemsettings>shortcuts>global shortcuts>kwin>Maximize window: set to Ctrl+Return
3.And some applications (like web browsers) also allow F11 to go fullscreen.