Maybe it's just me, but I find they way LibreELEC and OpenELEC run from USB flash drive unsatisfactory:
- you need to use the keyboard to choose "live" mode;
- in some cases you don't have enough time to choose "live" and installer is started;
- live mode forgets all of your settings once you power off.
Looking at what is written to USB flash drive, i see a FAT16 partition and an ext4 partition of just 32 Mb. When you run live, that partition will store lost+found data.
I therefore made the following:
- plugged USB flash drive in my laptop running Ubuntu;
- used GParted to expand the ext4 partition to fill USB flash drive;
to find out what the ext4 partition uuid was;
- modified syslinux.cfg to include ext4 partition as disk under "live" label, and
- removed prompt, and
- removed "installer" label and related instructions, and
- changed default to "live"
Now I can run from any x64 PC or laptop that can boot from USB and I get to keep my plugins and settings.