You will find the corresponding option inside:

Dashboard >> Appearance >> Customize >> BuddyPress Nouveau >> Directory Layouts.
Here you can select the layout style for directory content & navigation(option are listed below):

  • Use column navigation for the Members directory.
  • Use tab styling for Members directory navigation.
  • Use column navigation for the Activity directory.
  • Use tab styling for Activity directory navigation.
  • Use column navigation for the Groups directory.
  • Use tab styling for Groups directory navigation.

directory layout - Wbcom Designs

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