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CSpanner on menu then operation then Function Button set. I use FN16 for Near FN18 for Far bias. This was introduced in Firmware 2.0 and is in notes at end of revised handbook you can download along with firmware. The Custom buttons can save whatever you currently have. Loads of help for newcomers on Lumix Experience site by Damien https://lumixexperience.panasonic.co.uk/learn/expert-advice/