In the source workspace, click next to a piece of content or at the top of the column when multiple pieces of content are selected.
Click on the target workspace to share the selected contents.
Untick the target workspace to stop sharing the selected contents.
Shared documents are part of the target workspace list of documents with the symbol .
It is possible to sort native content from shared content by selecting Hide shares.
Check out the video Sharing content between workspaces: