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Tableau Desktop connector for Salesforce does not have built in a Global filter.
However a possible workaround on reducing the size of a Salesforce extract by filtering is documented in the article below.
To voice your support for the inclusion of this feature in a future product release, add your vote to the following Community Idea: Filter Data for Salesforce Extract
I hope this information helps.
Thank you that was helpful. I did not realise you can hide fields at the data source to recuse the extract size