At my current client, I came across a number of useful Azure DevOps extensions related to agile working. One of them is Portfolio++. A free extension that let’s you create roadmaps with epics and features across teams. In this case we shared the epics features of the Integration Team, the BI team and the Architecture Team. Very useful to align the activities of different teams. 

Other useful extensions are Retrospectives and Estimate. Also free. Google for them and get going.