Containers are a core building block of Howspace workspaces. Containers can be created and edited in the "Edit page" mode. Follow these steps to add a new container and edit the columns of the containers.
Go to "Edit page" mode
Click the plus sign to add a container
If you need multiple columns, click the plus sign in the container to add a column
You can re-size the columns manually by dragging the column width adjuster
You can find more information about container settings and features from the Container Feature collection