Thanks for your reply.
My image display is set up as you recommended.
The issue is, on my older X100, once I took a shot through the OVF, immediately the OVF would switch to EVF to display the taken image for 1.5s. In my actual case (X100VI), I take an image, but the OVF stays, no switch to EVF nor any image replay...
I suspect a firmware issue concerning that function (firmware 1.11)
🤔