This can be done in a few simple steps:
Click on your workspace name in the top bar. Like in the image shown below, the workspace name is 'Personal Space' with a down arrow. Click on the name.
It opens a menu with a list of all workspaces your account is associated with.
Click on the '+ Add a new workspace' button.
Give the Workspace a suitable name and click on 'Create new workspace'.
Voilà! You just got yourself a brand-new workspace!