Lists Personal App
The New Lists App surfaces Team Lists as Tabs within Teams however Lists in Teams does not currently cover Personal Lists. These should be surfaced in a personal app on the app rail along with every Team List that you have permissions to
This has caused me a good deal of upset the last few days. I watched a MS video that suggested I create a new list in 'My Lists' and when ready, share it with the Team. I can share the link and grant access via web browser etc, but I cannot add my list to a Team tab. This is 'by design' but sometimes you know this is just an oversight or too hard technically. It really needs to be implemented!