@edbj Your saved sessions are still there; click the "open in tab" button, navigate to the left side of the screen and click the "History and Settings" button (it will be the top one). Your saved sessions will be listed on the left.
I don't like the update either, I liked the ai being in the side bar. As far as I can find, there isn't an option to add it to the sidebar nor is there a way to open previous sessions without opening the bot in a tab.