Adjusting number of columns

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I'm using the Minimal theme. In the home page I have a gallery of images. WHen I try in the mobile model, it is ok: it appears just one column this means one image under the other. But when I see in my iphone7 ( and other old mobile phones) appears 2 columns. Is it possible to change this in the way I can see just one column in every mobile model?

Thanks a lot.