Parameters in Tableau for Confluence - Pro allow you to filter data that is used within the datasource that is used in the view. See: https://onlinehelp.tableau.com/current/pro/desktop/en-us/embed_structure.htm#select-an-example-view-to-work-with for a bit more background. You can also see more documentation on Tableau Parameters at https://help.tableau.com/current/pro/desktop/en-us/parameters_create.htm
Parameter values in a Tableau workbook are static user-input variables, and they do not operate the same way as dimensions. They only contain one value, and dimensions in the workbook contain a set of unique values that exist within the used datasource.
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