Yes - go to a magnification covering the entire area to be downloaded, select the Zoom tab in Manage Maps, choose the magnifications to download (don't use ridiculous values - besides usability concerns, most map repositories have only resolutions of 5 or 6 down, anything else will waste memory on no extra detail), and wait until the download has finished.

Be warned that large scale maps need huge amounts of card memory - a scale 5 of all Europe or the US will not fit any existing card, and even OSM would probably ban your IP for leeching if you start downloading tens of gigabytes.

A modest 8 to 11 are enough for all areas you only drive past, 6-7 will be enough for your immediate vicinity - 5 or 4 scroll so rapidly while driving that they hardly give any orientation, they are best left for places where you travel on foot.