How to 'unautomate' a clipping mask each time I apply a mask. Please help!

Good morning. I remember some time ago, altering something, somewhere in Photoshop, so that each time I apply a mask, it is clipped to the layer below it. I did not create an action (I was new to Photoshop).   The automated use of the clipping mask is driving me nuts, now that I am actually more proficient in Photoshop. I can't find where I can stop getting a clipping mask each time I add a mask. 

I am wondering if I altered something in my Photoshop Settings/Preferences.

I use a iMac. I would so appreciate getting rid of the automated clipping so that I can apply one if I need one, but not have each and every mask clipped each time I add a mask.

Many thanks in advance