Please visit our theme instruction page: themegrill.com/theme-instruction/spacious/. It’s clear and comprehensive, if still there is confusion part and something else you want to know than let us inform.
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After installing spacious there are now two widget editor interfaces. In order to make i.e. add widgets to the candidate frontpage as illustrated, one needs to use the standard wordpress widget interface and not their theme editor interface. This is explained in the video, but not in the written documentation. I’d advise revising the documentation to make this clear.