hey mate, i did this by holding power button.
at 100% charge, now after 5h i inserted my dongle (with the sx apk on my phone) it directly launched the app (seems autorcm was still in it even when "powered off") thing is the battery did drain during the 5h , from 100% to 65%....
so uhh that's not working , the only way would be to uninstall autorcm.
I'll just keep my switch in sleep mode, been using it that way for more than a month with no issues.
the only annoyance is like someone mentioned " fully drained battery " where you'll have to charge the switch for more than 20 minutes initially to get it to 1% then charge it up from there to 3h to fully charge it.