Knife Tool


I am unable to get my Knife Tool to function in CorelDRAW Graphics Suite 2017. I did find video tutorials on how to use this tool, but upon following the same steps from the tutorials, my Knife tool just won't actually make the cut after I create one.

What I am trying to do is just cut off the visible edges of an enlarged Boundary on a shape that ends in a triangular point. On one try I was able to cut the object itself but only vertically, and have not yet been able to diagonally cut the edges of the boundary off.

Is it possible to cut a Boundary with the Knife tool for editing?

Appreciate any information or resources!