Regardless, the topic of this posting is how to create irregular board outlines in KiCAD. This is sometimes needed when you are designing a PCB for an enclosure that may have a curved profile, or other unavoidable mechanical features for which one must design.
On with the tutorial... It's easy enough, in KiCAD, to create straight lines, polygons, circles and 90 degree arcs, but what happens when you need a slightly curved indentation, or outdent (i.e. an arc greater than 0, but less than 90 degrees)? Maybe a parabolic profile or an ellipse? Well if such features are critical to your design, then strictly from within KiCAD, you will find this to be a show-stopper. However, if you're anything like me, there is a voice in your head that tells you, "No..... There's got to be a way around this..." And if you have enough persistence, you will probably find a way. And that I have with this particular endeavor.
Once you have created the outline drawing, save the file as a monochrome bitmap image.
Find and delete the lines that start with "Li", "T0", and "T1". See this document for what these designations mean if you're interested.
Find all lines that start with "DP" and change the last numeric value to "28", which is the layer designation field. In KiCAD layer 28 is reserved as the Board Outline layer.
Save and close the file when finished with these manual edits.
Go to "Preferences > Library" and add the library module file which has just been edited and click "OK".
Go to "Place > Module" and browse for a footprint named "LOGO" and insert it into the layout. If your colors are set as the default, the board outline footprint you just placed should be yellow.