Design mode is the primary mode in Studio, where the core project development happens. In this mode, scenes are assembled by creating or importing 3D assets, adjusting materials, and adding interactive elements. Lighting, cameras, backgrounds, and effects can also be fine-tuned to enhance the final composition.
Design mode tools
Design mode tools
Selection tools
Primitives
Light sources
Modifiers
Deformers
Setup
Interactive elements
Switching to Edit mode
It is also possible to edit object geometry in Edit mode.
Learn more about it here: Edit mode