Here’s something that’s a little confusing: in this one respect, the sidebar Advanced Search Widget does not seem to work like the Advanced Search Widget that appears over the Revolution Slider.
In order for all “Types” to be shown in the sidebar version of the widget, properties must be assigned that type. In the page widget, it seems that all the Types will show even if properties aren’t assigned to those Types.
I might be doing something wrong or setting option improperly but I double-checked all the options and didn’t see an option to turn “All Types” on or off.
It took me a little while to figure this out so I thought I would save people the time if they are having the same problem. And also, to ask the creators if they are aware of the differences between the page and sidebar versions of the Advanced Search Widget!