I have installed SLED15 to solve a problem with the BIOS on a new mobo. I had been running SLED12 SP3 and all was fine until we had a power hit that took out the MOBO -- even behind a UPS!!

The SLED15 install for my wife's desktop system went to Gnome which works for me, but not for her. She wants the display to work like the Windows systems she is used to (I do a lot to keep from having to install that thing as a host on one of my machines).

1) There is no task bar w/ systray.
2) One can unmaximize but one can't minimize.

So I worked at getting KDE Plasma5 to install and set her ID to run with Plasma5. But it seems to fail back over to Gnome -- this is after a reboot.

What am I missing for configuration for this so that she can have the screens behave as they did with SLED12 running KDE?