Having trouble with brims

I’m not sure if I’m in the right place with the Creality Print 5.1 slicer. I’m having trouble with just one corner. I would prefer to use mouse ears, but nothing seems to change the image when I “Preview” the object. I’m in the “Bed Adhesion” section and I’ve tried “Mouse Ears”, but nothing happens. Do I need to pick corners?
creality_1

Mouse ears are there, 2nd down on the drop down, Creality Print 5.1.2.9904

Are you using the latest version…? I think an earlier version had issues showing the mouse ears in the previews… It seems to work now though…