Borders are now located at  the bottom of the PRINTS tab
The term FRAME is what I use when I use a cutout frame.

You can also try using new mats.

Fred

Cut Marks - Saw no mention of "hairline border," however I did see "solid black line" which to my OCD way of thinking is not the same thing.(Solid black line does not imply or suggest hairline.)

@Foxhills. I've just checked this out, and under the Printers and Settings tab/Cut Marks/Solid Black Line, you do indeed get a Hairline black border around your print. In this case, Solid means "not Dashed" rather than a thick line.
Hope that helps.

Creating a MAT is achieved by placing your image in the queue and a right click on it. That will give a menu option to create a mat
It actually says Photo Mat create uneven borders.
The beauty of using mats is that you can create any thickness, any colr and apply to all  sides or one or two sides. You can make a thick border on the bottom and add floating text on it.  Many things to play with.
Not the least of which is multiple mats. add another mat and another and another, various colors and thicknesses.
You have to try and use it a few times.
Fred

Here's a video from the  Help videos.
This should give you a better idea about mats
Fred


https://www.youtube.com/watch?v=gI_HRjl9414&feature=youtu.be