All BuddyPress pages are template driven pages like Activity, Members, Groups, Register.
Single-member profile, single group, or single activity use above base slug to display them. If you have to modify any look and feel, you can follow https://codex.buddypress.org/themes/theme-compatibility-1-7/template-hierarchy/
https://gist.github.com/r-a-y/5736878 you can use this plugin for component-specific debugging.