Zhang Yi had not given cultivation techniques or many resources so that these sects from smaller worlds would not get used to it badly and would not want to return, but even so, most sects did not want to return to their world.
And Zhang Yi forced them to come back using the Dao from his space just as he had forced them to go to his world of mental energy after all Zhang Yi had done this only to save them and preserve their world and not to have more people in his world.
Only people on the continent of the blue moon had a choice as to whether they wanted to stay in his world or wanted to return, to Zhang Yi's surprise almost everyone wanted to return, even the Rose Sect women and the Iron Sect, people.