Unfortunately, I don’t. And High Sierra is far too old for recent software. 

I tried to restart the PC, and still the same thing happen, the connection is on and off. Tried different (worked well with macbook) and samething happen. But tried with PC laptop (Acer), then the connection is ok, so my desktop PC has USB port problem. Then I tried to use capture one pro 20, for live view, but it won't show up. May be you know the minimum version of C1 pro that support gfx100 live view tethering ? As my macbook limited to High Sierra 10.13, and can't install newer OS. I notice newest FUJIFILM TETHER APP may support live view, does it ? Thank you so much for your advice and tips, really appreciate it. Best regards from Indonesia   

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Thanks Jerry   Changed both settings and it worked perfectly.

Welcome to the forum. Usually in the screen setup part, there is a setting called “Preview exp../wb in manual mode”, try turning this off. It may also be called “Exposure Preview“, it still needs to be off. Some folks additionally also turn on Natural Live View, but as always, you mileage may vary. I cannot help you with your second question, sorry about that, perhaps someone down the road can? p.s. turn it back on when not using the flash, or set a function button to toggle it on/off.