Remove 3-way Switch

I’m installing a smart switch and need to convert a pair of three way switches into just one smart switch. Given the two switches wired as below, can someone direct me on the steps?

Need to know what other wires are in those boxes.

That’s tough to say on the first (likely hot) one, as it is a 4-gang. Right behind this switch are two black in a wire nut. Nothing visible behind second switch.

There’s a reason why @Automated_House was telling you to identify other wires as well is because there are many other options for 3 ways wiring so it’s hard to guess without enough info. Have a look at this wiring options
3 Way Switch Wiring Diagram

And here for hooking a smart switch.

Very helpful. Thanks! I now know enough to call an electrician.

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