I have gone to OSMC - Programs - OSMC Settings 0.0.1 - Logging - and can't figure out what's next. Also tried Settings-Pi, but can't figure out what's next. Welcome any ideas!
As already stated in the comments, you can't.
A commonly used workaround is adding your own script that changes the boot OS like so:
#!/bin/bash cd ~ mount /dev/mmcblk0p1 noobs cd noobs mv autoboot.txt autobootkodi.txt mv autobootother.txt autoboot.txt reboot
In the other OS you do the opposite of the above as a shutdown script.