Check out the sizing topic in the online help - https://onlinehelp.tableau.com/current/pro/desktop/en-us/help.html#dashboards_organize_floatingandtiled.html?Highlight=s…
This workbook appears to have a fixed size and therefore will be left justified unless you place that view within some enbed code on your own html page - the way we do with Crow's Nest
I hope that gets you going and best of luck
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