The mAuthor editor offers now the possibility of showing or hiding the selected modules in the editing mode. This function is very useful while working with presentations containing many background layers.
To hide a module or a group of modules, simply select them in the "Modules" list on the left side of the editor screen and click on the crossed-out eye icon. The module(s) will be now hidden and not visible in the editor. To show the modules again, select them once more and click on the open eye icon.