Processes | Expression Parameters | Delete rows with at least this percentage of Missing values

Delete rows with at least this percentage of Missing values
Use the field or slider to specify the minimum percentage of missing values in any row at which that row is to be deleted. For example, specifying 50 results in the deletion of any row with at least 50% of its values missing.
To Specify the Missing Value Threshold:
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Tip : To change the scale of the slider, right-click on the slider and select Rescale Slider from the pop-up menu. Change the upper or lower boundaries in the window that appears, to rescale the slider and click OK .