Select the item you want to hide the pattern, Right-Click and select Override Graphics In View > By Element and then select either Surface Pattern or Cut Pattern and turn them off (depending on if the item is in section or plan/elevation.
Select the item you want to hide the pattern, Right-Click and select Override Graphics In View > By Element and then select either Surface Pattern or Cut Pattern and turn them off (depending on if the item is in section or plan/elevation.