Short answer: Live View centred on bright star, max display zoom, manual focus.
With a point source like a star, the optimal focus point is usually obvious, because that's where you get the tightest smallest dot on the display. If too bright or unclear, reduce aperture, or pick a not-quite-so-bright star. (Worth double checking anyway till you're confident in your method.) Focussing on the Moon is not very reliable.
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