Welcome to WileyPlus, where literally everything is poorly thought out, and heres the fun part, you have to pay for it! Hate this program, if it wasn't required for my course I would definitely not buy it, as well as warn others not to buy it as well.
To answer your question, you could try to open the session in another browser, as far as I know it bases its sessions on cached info and its not server based. Have like one safari session and one chrome or whatever session and it should be fine.
Thanks for reaching out Sean--Unfortunately, WileyPLUS is designed to only be open in one window or tab at a time.