I have tried some of the examples in the suggested post but I get compile errors.
Here are some of what I have tried

@ CONFIG FOSC = HS
opcode expected instead of config

ASM
CONFIG OSCS=OFF ; Oscillator switch OFF
ENDASM
Same error

@ __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H
Same error

I am using Picbasicpro with microcode studios