Categories which have fewer than ten courses will show the full summary but those with more will only show the information icon. If you want them all to show the full summary then change the number to...
By default moodle will only show names of teachers on course descriptions. If you want to add other roles, check the roles in Settings > Site administration > Appearance > Courses> Course contacts...
By default moodle will show names of teachers on course descriptions. If you don't want this, uncheck the role in Settings > Site administration > Appearance > Courses> Course contacts...