Omnixx Force doesn't allow you to delete a workspace from the program's interface and you will need to remove it manually. To do this navigate to your Omnixx Client folder in your PC's (C:) drive, select the file and delete it. By default, you should find this file in (C:) > Omnixx_Client > Omnixx > Profiles > Your profile name > Workspace. Right-click the .wsp file and press the Delete option.