Post a picture looking through the window back at the cabinet and top please.

Here ya go. The grey thing was the window opener that they took the knob off of.

You can replace the handle crank with a butterfly crank that won't interfere with the counter.

Thank you they were already getting that. My concern was more that water is going to go on the windowsill, any ideas of what to do as like a backstop so that doesn’t happen.

wow, that's kind of weird. I understand your concern. What about a small strip of countertop material? It probably doesn't have to be real high - just enough to stop overflow off the counter.

If your house isn't brick, I'd raise the window.

Kicker, it’s brick

That sucks.

Can you get a strip of stainless steel bent into a very shallow U? It could lay on the countertop as a sort of window well, with caulk sealing it to the countertop.

Long term I would look into replacing the window with something shorter, but Covid + winter makes this a bad time to do it.