… a little late, now, unless you want to re-install, you have the option in the installer to decide what you want instead of what the installer proposes. I have never accepted the proposed setup in the installer, instead opting to choose my own disk layout and file systems. There is an advanced partitioner in the installer that allows you to do that.
… or, if you understand what you are doing, you can back up all files from your home partition and reformat it to ext4, then restore all your files.
The best way to do that would probably be with a live CD/DVD or live USB device. I would recommend you use GParted Live or Hiren’s Boot CD (use the live partitioner from the first menu that comes up).
You could then straight copy the files to another device or another partition (linux partition, of course, to keep all linux file parameters intact), reformat the /home partition, then copy the files back. You might have to then re-run the Grub installer from the Rescue disk, but if that is the case, simply come back here for directions – unless you already know how.
I wonder how I could get clonezilla installed on my opensuse installation.
Not sure why you want to do that. I use Clonezilla all the time, but from boot CDs and boot USBs. That is usually the preferred and most reliable method.
KDE on OpenSuse Leap 42.2 is more snappy and the system is actually very very stable.
Yes, another good – for some, even better – method. But the main point of your message – I assume – is to give a (so far) unanimous vote to doing this kind of an operation from a Live CD/DVD/USB.
BTW: Interesting new avatar, if I could only make out what it is. Too small for my eyes to see.