buddypress scholar with 4 page templates - How to choose them?

BuddyPress Scholar comes with 4 page templates: full width, sidebar left, sidebar right and 3 columns.
How to choose them on page of BuddyPress (Group, Member ...)? I'm looking forward to each page of buddypress is true "full width" page
Ex: http://ghostpool.com/wordpress/supermassive/buddypress/groups/, http://ghostpool.com/wordpress/supermassive/buddypress/members/ ....

I'm setting up multisite with BuddyPress Scholar child theme

How to remove

Please log in and add widgets to this column. Add Widgets

ex: http://buddypressthemes.org/groups/
on single page of BuddyPress Scholar theme?