There is only one truly simple digital camera, in the parlance of simple being 'ISO, aperture, shutter time, and focus' ... That was the Leica M-D 262. No menus, no LCD, no way to erase or review images captured, just the absolute bare bones needed to have a Leica M with a digital sensor instead of film. I had one, I loved it, and I foolishly sold it and moved on to other things. Dumb on me.
That's not to say that you cannot obtain a quality digital camera and set it up to be used simply, in similar context. That's possible with most digital cameras of any worth. A problem in our heads is that because there are all these options on most of them, we have to try to use them. And sometimes they are useful... but they clutter our mental space.
So the trick is to find a camera that you can learn ONCE, set up ONCE, and then just use until you wear it out. Just like you do with a film camera. And that, once in a while, when you find yourself needing a funky setting for something or other, it doesn't take three hours and a 500 page book to discover the setting and use it, then get the camera back to normal. I use the Leica M10 Monochrom and M10-R this way. The menus are relatively brief and understandable, and once I had them set up, I rare use the menus for very much at all.
A friend of mine, Ed, had one of the Olympus cameras that had been ballyhooed a good bit, I think it was the Olympus Pen F of 2016. A nice camera ... I had one of that generation's models too. But it drove him nutty just like it did me ... Too many options, in a word. I sold mine after a year of trying to use it and the person who bought it is delighted with it still. Ed just couldn't get his head around the menu system design. After debating it a long, long time, he bought a Leica Q2 Monochrom. A far, far simpler camera to use, in every way, and he had it nicely setup for use in ten minutes. The Q2/Q3 are excellent travel cameras, nice in the hand, excellent lens, and a minimum of nice, usable features.
That's what I'd recommend. Unless you want interchangeable lenses...
G