Hi,
« in » workspace switcher » just drag and drop icons from a workspace to another.
Right click on title bar of a window app, move to…
Right click on title of an app in panel if you use pixel-saver applet, which gives the same ability as previous right click on title bar…
Right click on icon of an app in icon tasks list ( if you use it ), click on right arrow on the last item of the list…
See also
All paths lead to Roma 
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