To export data from a visualization, 
Choose the visualization that you want to export. Make sure that it is selected and highlighted.
I) At top right on the visual, open the menu and choose one of the following:
To export to CSV, choose Export to CSV.
To export to XSLX, choose Export to Excel. This option is available only for pivot tables and table charts.
II) Depending on your browser settings, one of the following happens:
The file automatically goes to your default Download location.
A dialog box appears so you can choose a file name and location.
A dialog box appears so you can choose to open the file with the default software or to save to.
Also, remember that you can't export data from an insight, because insights consume the data, but don't contain the data.
QuickSight doesn't support exporting data from more than a single visualization at a time. To export data from additional visuals in the same analysis or dashboard, repeat this process for each visual. To export all the data from a dashboard or analysis, you need to connect to the original data source using valid credentials and a tool that you can use to extract data.
Hope this helps !!
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