To open DesignEditor, from the View menu, select DesignEditor. DesignEditor consists of two tabs, the Layers tab and an Objects tab.
You can also press E on the keyboard to open DesignEditor.
DesignEditor - Layers tab
DesignEditor - Objects tab
DesignEditor - Layers Tab
Designing with the Bad Wrap™ in DesignEditor
DesignEditor - Objects Tab