yes if you are making a child them then you can copy and past or after that you can edit files. if you are making a theme or it is not a child theme so there should’t be any sidebar till then you don’t add the code
hi squared index you don’t mention what type of theme you are creating. if you are creating a child theme so you have to copy all files with the folder which have sidebar from defaul bp-them like activity folder with the index file or other folders and main index file after that simply remove the line
<?php get_sidebar( ‘buddypress’ ); ?>
usually this file locate in the last of index files.