KCTS Seattle stopped afternoon kids' programming years ago. It's now mostly Downton Abbey, Masterpiece Theatre-type repeats in the afternoons. It may have to do with the fact that the "PBS Kids Go!" branding is no longer used for their elementary-age programming (Arthur, Odd Squad, etc.)
Northwest Public TV (KTNW/KWSU) still airs PBS Kids up to 5PM weekdays. They take a 3-hour break from 11:30-2:30. That will end next week as PBS drops several hours nationwide, and the elementary-age shows (Odd Squad, for one) are off the .1 schedule. Some stations will likely promote the PBS Kids subchannel for the afternoon timeslots. Many of those shows air on that channel during the late afternoons when the elementary audience is back at home (or, at daycare). But do daycares even have TVs anymore? Between the streaming, the arts/gym activities, and the Internet math/reading intervention (iReady, etc.) what's the point of a TV playing cartoons? Not to mention the 2nd-5th grade audience is likely doing HW, soccer/basketball/baseball practice, or playing on a Roblox server.
I'm a substitute teacher now, so I know. Kids talk about "streaming" a movie over the weekend with their friends and playing video games on a Saturday night sleepover. I had a 3rd grade class a couple of weeks ago, and surprisingly, one of the kids still reads AND watches the Arthur TV show. I was pleasantly surprised as PBS isn't airing it as much anymore - and didn't it wrap up production a few years ago?