When you start Plotter from Workbench, you can change the dimension of the plot–area via the .info–File. Plotter knows the following keyword: WIDTH1, WIDTH2, HEIGHT1, HEIGHT2, TEXT1 and TEXT2.
WIDTH2 should be greater than WIDTH1 and HEIGHT2 > HEIGHT1. With TEXT1 and TEXT2 you can change the itemtext Dim1 and Dim2. Add two leading spaces, look at the example .info–File.
Plotter opens a screen with the Dimension WIDTH1/HEIGHT1 and allocates memory for a bitmap of the dimension WIDTH2/HEIGHT2. So you should have enough memory for the second dimension.