How to set Manual and Stabilized modes differently for VTOL in QGC

In ‘Multi Channel Mode’ of ‘Flight Modes’ setting in QGC, Manual mode and Stabilized mode cannot be differentiated. But, in ‘Single Channel Mode’ setting, they can be set separately.

So the ‘Stabilzed/Main’ mode setting in Multi Channel Mode is for Stabilized mode or for Manual mode? If it is for Stabilzed mode, then where is Manual mode setting?

According to FW document, Manual mode and Stabilized mode are different in FW and VTOL though they may be same in MC.

PX4 1.7.3 on Pixhawk2.1, QGC v3.3.1., DeltaQuad airframe