Begin by selecting the cabinet that you want to change the shutter mechanism 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 "Split" option.

Click on the same and the single shutter will split into multiple shutters as per the number and size of internal partitions that exist.

In case you want to merge two shutters, select the first shutter and go into "Shutter Systems" menu, and then "Construction" tab.

Choose "Merge" tool this time and click on the second shutter you want to merge.

Both shutters will be merged.