Generating preview triggered every time I confirm a segment

As per title, I often have to wait ages after confirming a segment to go to the next as Studio starts generating preview, which I didn't ask.

I have look into the different threads regarding this issue, and no one seems to have a clue about it; maybe it has change? (I don't have a shortcut for this function, and did try to put an odd shortcut to see if it would solve the issue without any success).

Any help would be more than welcome.