Short answer
Agents > Agent Inbox lists agent runs and their results. HubSpot's KB says it is the place to review output when monitoring several agents or recent runs, and you can export a run's output to a PDF. In my demo portal it holds one Company Research Agent run, and Run Agents starts a new one.
1. The inbox
My demo portal:

2. Before running more
Check credit use. See HubSpot Credits.