In brief
flex-wrap determines whether flex items may move onto additional lines. The initial nowrap keeps one line even when fitting becomes problematic.
Useful to know
flex-wrap determines whether flex items may move onto additional lines. The initial nowrap keeps one line even when fitting becomes problematic. [1]
For a group of filters, wrap is often a better starting point. Still check item widths and minimum constraints; allowing wrapping does not fix every oversized piece of content.
Sources
For further detail and to check the information: