Due to the way PCBs are created from Gerber files (essentially an optical process where the tracks are defined in terms of apertures), bends and track ends are inherently a segment of a circle. Track ends are therefore always semicircular. There is no setting in EasyEDA to redefine track ends as anything other than radiused. I don't think there's an easy workaround to create square ended tracks and lines. Maybe if you drop a Solid Region set to No Solid over the bits of the round ended track that stick out on the far sides of pads to simply crop them out? Like this? 

Thanks for the quick reply and I will try your suggestion Fred