In Winner, the default setting of plinths being placed under units is automatic.
As plinth is automatically generated, if a unit of shorter depth is placed next to other units, for example to make an island or peninsula/breakfast bar, Winner will create plinth where it is not necessary. 
Solve this by adding an automatic filler on the unit with shorter depth.
- Select the required cabinet.
- Right-click and select Automatic offset from wall > User defined offset.
Winner Design will automatically add a filler between the cabinet and the wall or island. The unit behind the shortened one will effectively act as a wall for the unit.
This will remove the automatic plinth as the unit with shortened depth is now connected to the units next to it:
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