How to enable ramp setting or feature?

"But i can’t find the ramp setting"
For vector Fills this is available in the Advanced tab of Cut Settings window for a particular layer.
For raster images this is available only for Threshold image type at the bottom of the of settings.

"how to invert/reverse the image"
For image layers there is a “Negative Image” selection in Cut settings.
For vector designs you can negate the image by surrounding the existing design with a shape present on the same layer as the rest of the design.