Originally Posted by
nicfromwales Open Lumia Storage Check, swipe across to Details, click on Change under Maps, choose SD Card. It's very simple.
That has never been part of the regular Lumia Storage Check, but only in the Lumia Storage Check Beta, which Microsoft has decided to discontinue in favor of Storage Sense. I'm not sure if the Nokia tool is still in Cyan, but it's definitely likely to be removed in a later firmware update. Tbh, if you have everything set to SD card, you should still have plenty of internal memory available, so having maps stored that shouldn't bother you much.