SpeedyBeeF405 wing mini - RTL and LOITER

“Glider” flies and circles very stably in FBWA mode.
The “Glider” should also fly just as stably in RTL or Loiter mode.
What parameters do you have to change to achieve this state?

RTL Mode (Return To Launch) — Plane documentation (?)
Glider always slide continuously downwards and therefore cannot maintain altitude!
A height setting is therefore not recommended for “Glider” and only leads to strong oscillation.
What can I do to make the GLIDER circle stably under RTL and LOITER?

Dear Moderator, please close this thread, it’s a duplicate of

discussion started there. Thanks.