To export a widget, point your cursor over the required widget and click on three dots displayed at the top right side of the widget tile as shown in the following figure.
Exporting a widget can be done in the following ways.
Exporting as CSV
Click on the Export CSV button to export the metadata under that widget in an excel sheet which includes dimension and metric names.
Exporting as Raw data
Click on the Export Raw Data button to export the raw data of the widget to the local system.
Download as Image
Click on the Download as Image button to export a widget into the local system.