How do I access the config.advanced setting, can this be done via console or will this involve re-compiling firmware?
As I’ve never recompiled firmware before so I wouldn’t know where to start.
If you are asking about Marlin firmware, there are a variety of settings that can be accessed by sending g-code. Beyond these settings, you must recompile and reflash your board. See the PlatformIO description in the docs for compiling the firmware. Links to various firmware versions can be found on this page.
Settings are changed by editing configuration.h and configuration_adv.h.
If you provide information about what specifically you are trying to change, someone on the forum could give you further guidance.