Set the number of columns on desktop (1960px+), laptop (up to 1280px), tablet (up to 980px), and mobile (up to 640px)

matrix:number_of_columns(INT on_desktop: 2
, INT on_laptop: 2
, INT on_tablet: 2
, INT on_mobile: 1)

matrix:number_of_columns(6, 4, 2, 2)

#===
matrix:number_of_columns(number_of_columns_in_desktop: 2)

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