By default, the btrfs install takes 1/3 of the drive for the root and the snapshots (160gb), leaving the home with the rest. I want to do the btrfs install with root and snapshots down to 64gb. (I don’t need many snapshots, only 2 or 3. For me, the space for a regular root would be around 12gb to 16gb of usage.)
How can I set the partitions? Any step by step guide?
The deafult installation nowadays makes one btrfs partition that includes /home. That is not whate you describe. Are you sure that 160 GB is not including /home?
And of course, what ever the installer offers you, it is only a suggestion. You can change that or even ignore it completely using the expert partitioner from the installer.
I have found a youtube video from techsolutionz that shows how to set custom BTRFS partitions on Leap 15.4 during their install (must be the beta, since it hasn’t been released yet). It’s quite simple after viewing the video.