Mission vs rtl

how can i make sure that the mission is finished instead of rtl if a loss of the tx signal occurs?
If there are only a few very tall trees and a suitable rtl ascent descent combination consumes far too much battery.
There are many situations where rtl is the most dangerous way.

Have a look at this parameter:
https://dev.px4.io/en/advanced/parameter_reference.html#NAV_RCL_ACT

thank you for the info … this parameter i knew and it should normally set to return, cause that is the most safe setting if there is no mission with waypoints close to the start location loaded and executed. Especially if there is rtl at the end of the mission or the last waypoint is close to start, there should be an option to auto override rtl on rc control loss for not interrupt the mission I think.

I’m not sure I understand. How exactly would this auto override work?