Literally only 1/2 of a 1/16 hole is showing...probably a few mm of it...
1/16" is only about 1.6mm !!!
Until very recently, I designed every knife so that the detent hole was completely hidden.
It's a lot of extra work sometimes too, getting the lockface as far from the pivot as possible, and keeping the detent hole inside the liner.
Then, I built a prototype of a small knife for True North.
His only beef was handle to blade ratio, and he wanted it better, feeling the handle looked too big for the blade.
Well, there was no way to improve it without seeing the detent hole, and I told him so.
"Brian" he says, "who cares about that?"
"I do", I replied.
"No one else does" he said, and proceeded to show me a dozen or more knives from some big name makers that all had the detent hole showing.
I took it upon myself to start asking my customers about it, and of the 20 or so people I asked, 1 guy said he doesn't really like it, but it still wouldn't be a deal breaker for him.
I quit being so concerned about it.
Your mileage may vary...