Regarding Square Holes (in the SS13D01):
Those holes are for mounting. (the part has Metal Tabs). Nearly all PCB’s receiving this type of feature use Round Holes. The ‘Rectangle’ in the layout is the Boundry of the Tab - the tab is not uniform shape.
Therefore, just grab the ‘Hole’ part and set the Ring Thickness = 0, and the Hole Diameter to 1.2mm.
Most all of the slide switches I use have some version of these tabs, they can be bent over to hold switch on the PCB to reduce the Force of Handling/sliding On/Off.
Sometimes I bend them such that they sit flat on top of the PCB (depends on the project).
Otherwise, a custom PCB with cutouts is needed…
Oh, you may not want this but, I posted my version of LM386 along with some images of Actual Amplifier (scroll down this page)