I never encountered this issue. I think you can try a different browser or refresh the page?

I think you can try TP-Link Network Deployment Advisor. It may help you find the best solution. https://www.tp-link.com/smb/select-product/

@GunterK Hey, There is no big difference whether you connect them both to your router or connect them serial. It is up to your deployment. But what network behavior do you expected? To upgrade the...

@Bald_Beaver Every time you clicked a device, you didn't close it, so it stacked there. You should click the close button on the right upper corner to totally close those devices.

@Bald_Beaver You can put the AP to a different site and only enable band steering for that site.

If you have created an ACL rule to block all LAN to internet, you need also to create another rule to allow the router to transfer your packets out. And this allow rule should have higher priority...