I,m not sure mate, you could make the task bar to the dimensions of your screen, also you can add the tile , true size , stretch property to the location. This does not always work but there,s nothing to stop you trying. In the image I,ve posted there are 3 options in the dropdown where it says tile,once its added to wsb window you can click where it says tile to try other options.
You never know whats possible with this app, but there are lots of options in the add property window,if you have a result let us know, good luck.
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