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I have a polygon which is actually composed of many polygons but it results as unique geometry in the shapefile. It's easier to explain with a picture. The yellow parts are in my shapefile a single polygon. I want to make each part be a different polygon with different attributes.
I tried with "Multiparts to single part" but the result is another layer with only those polygons. I need instead a unique layer.
Your approach is almost correct. Singleparts to multipart from vector menu is (from version 2.16) using same tools as in processing toolbox, and as other processing tools from toolbox takes only selected features from input vector data by default. This can be configured in menu Processing -> Options....
So deselect all features in layer, and run it again.
If you don't want create new layer, you can also edit the layer and use Split selected multi-part features to single part function from Digitizing Tools plugin.
I have found latest version has this processing tool "Polygon Part to separate polygon" which does the work.
