Hi Daniel,
I’m sorry that for the time being, we cannot completely manage SharePoint lists within Access Web App. If we need to edit the list, we have to access the list and edit it. You can also try the methods provided by Robert.
I understand this may cause inconvenience to manage your organization sites. Meanwhile, I think this point is very good and valuable. Could you submit feedback to our product team via the following link?
http://g.microsoftonline.com/0BX11EN/135
I have also forwarded this requirement to the product team. The new feature releases often originate from customers' feedback. In the feedback description, please specify your situation and requirement in detail. Hope editing SharePoint lists in Access Web App will be available in the future so that your requirement can be met. Thanks for your understanding.
@Robert, we appreciate your efforts.
Best Regards,
Kevin Cui