Can someone please tell me how to preview the DOF? I am new to fujifilm and have the x-e3. I often shoot using tight DOF based on my past experience, but after reviewing the manual and googling I still don't understand how to use the Preview DOF. It seems like I have to set a it to a function button and hold the shutter release down half way, but it's hard to hold the shutter release half way down AND press a function button with one hand. I am sure I'm simply missing something obvious, so thanks in advance for the answer!