Hi everyone!
I just open this account to say what I do when using SX.
First of all, before I used SX, I created a secondary account without internet.
1. Turn on airplane mode, then turn switch off, boot SX and play (using secondary account).
2. Turn off switch, boot OFW (normal turn off/on, not using the SX OFW option).
3. BEFORE turning off airplane mode, I delete all the games that SX mounted (Manage Software -> Delete Software). This "delete" the game from the system except the saves (XCI on the SD isn't deleted).
4. Then I use my switch with internet with my primary account.
I know that the switch keep logs, so maybe all of this is for nothing, but still I would keep doing it just in case and for testing purpose lol.