When you want to make a draw or lasso selection, you must first click inside the visualization and turn on lasso selection by clicking the lasso icon at the top of the visualization. On a computer, you can also press Shift and make the selection.
You draw a freehand line to select several values/data points at a time. You cannot draw to deselect values/data points.
In a table or a filter pane, you draw across several values to select them.
In a line chart you draw along a line to select a number of data points.
In a scatter plot you draw across a number of data points to select them.