Criar um nicho na sua parede [EN]

You need to create a recess or niche in your wall 

In the menu:

- Build

-- Doors and windows 

--- Openings

For a recess, choose an opening.

For a niche, choose hatch. 

Position your opening on the wall:

Then in the menu:

- Decorate

-- Customisable shapes

Choose "plan" (for example) and make it a little larger than the opening. You can then position it as the back wall: