How to adjust the left side to be larger than the right side when grinding the workpiece with a cylindrical grinder?

Hello nih,. Your workbench and the grinding wheel are not perpendicular. Look at the left side of the workbench. Loosen the pressure plates on both sides of the workbench. There is a screw on the right side of the cylindrical grinding workbench. Just turn the screw. It is best to have a meter on both sides of the workbench. Adjust to the position you need,