Begin by selecting the shutter that you want to change the shutter reduction for.

Look for the menu labeled "Shutter Systems" on the right of the design panel. It would be arranged in a vertical order as Cabinet>Partition>Shutter System>Shutter> Panel etc. Click on it to access the settings related to shutter systems.

Within the "Shutter Systems" menu, go into the "Construction" tab and you will find the "Reduction" section. Click on the drop down next to it to open the details.

In case of a drawer shutter, look for "Drawer" menu and go into "Construction" tab. You will find the "Reduction" section in the same.

By default the shutter reduction is considered as 1mm (or as per the revised inputs in the seller portal).

You can input a revised value in mm for any of the sides of the shutter to change the shutter reduction on that particular side.