This feature allows you to debug your complex configured actions and check inputs/outputs in the console on the SharePoint runtime.
In order to use Debug mode you need to enable this option in the design time, go to SharePoint runtime, open console tab in the developer tools (F12) and execute your action.
Note: This mode can be activated to the current site only
Debug mode option is available in the:
- Action Builder (Modern Forms, List Actions, Automation Actions)
- Solution Settings dialog in the Solution Studio
- On the selected deployment in Deployment maintenance tab