In D365, processes such as Actions, Business Process Flows, Dialogs and Workflows can be created and managed through Settings->Process Center in the Dynamics 365 site map:
This option has been known to disappear for some organizations. If Process Center is missing, perform the following steps to re-enable the option in the site map.
First, go to Settings->Customizations and customize the system. Open Client Extensions->Site Map:
This will open the Site Map Designer:
Change the Title and Id to Process Center:
Next add a Subarea:
Change the Entity to “Process”:
Click Save and Publish:
Refresh your Dynamics 365 page. You will now be able to see the Process Center in your Site Map.
Note, you can also create and view processes through Customizations: