For zigbee networks which overlap, it’s best to set them to different channels, with respect to your wifi 2.4GHz channel (which should be on a fixed channel)
Pro 2019: You can change the zigbee channel here, and you’d know, possibly not all devices can find the new channel on their own, just re-pair those.
Pro 2023: not sure if you can change the channel manually.
If not, the only way is the way Dijker alr explained: first, fix the 2.4GHz wifi channel, and next, reset the zigbee network; It’ll find and use the most quiet channel.
