I can't seem to find a setting that disables the RTH upon loss of remote signal.  Maybe I am missing it, but I can see the Smart RTH under the battery options, and I can see the vision settings, but no option to completely disable RTH.

I plan to fly under the canopy of some trees and it would be bad if the aircraft raised in altitude and tried to return home.

Should be in there by the rth height setting. Rth or hover, set hover.

That is where I thought it was too, but I see no option for it anymore:

Within the MC settings scroll to the bottom and choose advanced. It's about halfway down the advanced settings page.

Thank you!  I knew I had seen it somewhere but I couldn't for the life of me remember where.  I never wanted to turn it off before this.