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This question is for David Farkas or anyone else that has the answer. I have a Leica SL. I am attempting to utilize back button focusing. According to your You Tube presentation, in the main menu>Focus Mode>AFs,AFc,MF, activate MF and the toggle control will perform not only AF but also will permit moving the focus point around the EVF screen. I attempted to do that except that MF was grayed out. I should add that I am using a Sigma L mount DG/DN 45mm f/2.8 prime lens which functions correctly in all respects on this SL (601) camera. What is going wrong or is there some additional steps I should be taking? I really want ‘back button focusing'.