These docs are for an old release.
View the v7 docs
dayMinWidth
A minimum width for day cells, past which the calendar scrolls horizontally. When the calendar gets narrow enough that day cells can no longer meet their dayMinWidth, horizontal scrollbars appear.
number of pixels, undefined
For vertical resource view, daygrid view, and timegrid view.
Requires the @fullcalendar/scrollgrid premium plugin.