To make the organisation of courses easier, it is possible to collect activities together in so-called flows. You can think of a flow as a folder or grouping of activities.
To create a flow click on the blue button that says Add activities & flows.
In the new page that will show up, you can choose from different flows. If you want to bundle your existing activities you can create your own flow, by selecting Empty flow.
Give your flow a new name and add activities to your flow to get started. You can either use the sidebar to drag and drop existing activities into the flow or create new activities.