Stop Substance to replace my materials on layer by clicking materials in asset browser

Hi,

If I have a material in a layer, and when I am browsing materials in assets browser and when I click a material instead of drag&drop on the layers then Substance overwrite materal on the selected layer but keeping the name of the layer. Substance is very slow (I have top end PC) so many times Substance accidentaly replace my existing materials when I browsing materials. This is very frustrating, how can I turn off this function?