Those steps are for testing on the Sandbox Webhome but can be applied elsewhere.
- Override layoutExtraVars.vm (which is already imported in layoutvars.vm) in the skin applied to Sandbox.Webhome
- Add the following code
- Open the Sandbox page. Left and right panels are hidden
- Edit the page in wiki mode
- See that the right panel is displayed above the editor (see attached screenshot)
Panel shouldn't be displayed OR displaying it should be forced as it's important in this case