Hi Marina
There is a description in the config-dist.php file on the setting options for the default blocks for new courses
Add to the config.php file the blocks you want to appear For example
$CFG->defaultblocks_override = 'participants,activity_modules,search_forums,course_list:news_items,calendar_upcoming,recent_activity';
// These variables define DEFAULT block variables for new courses
// If this one is set it overrides all others and is the only one used.
// $CFG->defaultblocks_override = 'participants,activity_modules,search_forums,course_list:news_items,calendar_upcoming,recent_activity';
//
// These variables define the specific settings for defined course formats.
// They override any settings defined in the formats own config file.
// $CFG->defaultblocks_site = 'site_main_menu,course_list:course_summary,calendar_month';
// $CFG->defaultblocks_social = 'participants,search_forums,calendar_month,calendar_upcoming,social_activities,recent_activity,course_list';
// $CFG->defaultblocks_topics = 'participants,activity_modules,search_forums,course_list:news_items,calendar_upcoming,recent_activity';
// $CFG->defaultblocks_weeks = 'participants,activity_modules,search_forums,course_list:news_items,calendar_upcoming,recent_activity';
//
// These blocks are used when no other default setting is found.
// $CFG->defaultblocks = 'participants,activity_modules,search_forums,course_list:news_items,calendar_upcoming,recent_activity';
Regards