On the latest unstable steam update 24,6 patch I noticed that even after building several workshops I couldn’t see any furniture and decoration in the build/edit mode.
For the old builder, or for the new builder? 
The patch was for the rickety branch, not for unstable.
sorry, the old builder !
              
              
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          Hopefully the new builder will make its way to unstable soon.
Sorry for the inconveniences!