Blank visuals when no slicers selected

Hi,

I would like to blank few visuals on my dashboard (not all) when no slicers are selected.

By default my dashboard will have all the slicers unselected so I would like to blank out 3 visuals which are LongTextViewer and as soon as any of the values in any slicer is selected it would display the text.

I guess it's DAX, but I'm not very experienced in it

Thank you