As a workaround, create a pptx file with only the current view, change the setting in the workbook from Tabbed Views to 'Hide Tabs'.
Note: If the workbook has been published to Online with 'Show Sheets as Tabs" option enabled, the "Download as PowerPoint" will create a file containing all the views in the workbook. See Showing or Hiding Tabs for a Published Workbook in the Tableau Knowledge Base.
Additional Information
The ability to select which sheets, dashboards, or stories to export to PowerPoint has been added to Tableau Server 2019.3.
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