I've noticed that in the manual (page 13), it gives a lengthy description of the P-A-S switch (top left on remote). However, the DJI GO 4 app, in the Main Controller Settings/Basic Settings) makes reference to the P-A-F switch with a slightly different description (I think) for the "F" (Function Mode) position. Should it make reference to P-A-S ? or.. have I misunderstood this setting ?

The real settings is P-S-A there is no position for F on the switch on the R/C instead this is controlled by the R/C icon on the left of the dJI GO4 application when opened. If you touch this icon at the bottom of the screen a selection of different "functions" will be shown. Some are greyed out as these are still to be delivered.