CURA 3.2.1
On the Machine Settings tab I have the following;
Printer Settings X 300, Y 300, Z 400
Build Plate = Rectangular
Checked both Origin at Center & Heated Bed
On Printhead Settings
Xmin = 0, Ymin = 0, Xmax =320, Ymax = 320
Gantry height = 0
Number of Extruders = 1