The recovery mode won't help a soul. Even if they could possibly reset the phone. It would need your Samsung account login to get passed the second screen. Then your Google account for the 4th screen.
Also set your phone to back up
or use smart switch to back it up (its encrypted with a passcode protection. )
But that only applies if you turn on find my phone , remote unlock,
As long as find my phone is turned on the reactivation lock is enabled. (You can't reset the phone and use it without the Samsung and Google account info of the account that was on the phone before the reset = yours.
For the last three years, I switched to Apple due to this: https://eu.community.samsung.com/t5/mobile-apps-services/feature-request-directly-sync-samsung-healt...
Previously I used TWRP to set a pin for recovery mode since Android devices didn't have this.
Thanks all for the response.