To create inner faces on an existing face in Blockbench, Libby should use the "Inset Selection" tool.
What tool should Libby use?
This tool allows her to create additional faces within the selected region, essentially adding detail or depth to the existing face.
The "Inset Selection" tool in Blockbench is a feature that allows users to create additional faces or geometry within an existing face. This is particularly useful when creating 3D models and wanting to add details or depth to specific parts of the model.