This is a matter of scholarly difference. The common practice among many hacilar is to exit Mekke to the nearest boundary of the Haram — usually Masjid Aisha at Tan'eem — to enter a new state of ihram and perform another Umre. This practice is widespread and permitted by many scholars, including Sheikh Ibn Baz, who considered it a virtuous deed and a form of drawing closer to Allah.
However, a number of scholars, including Sheikh al-Islam Ibn Taymiyyah and Sheikh Al-Albani, held that performing repeated Umres by exiting to Tan'eem is not from the Sunnah and was not practiced by Hz. Peygamber (sallallahu aleyhi ve sellem). Hz. Peygamber performed four Umres in his lifetime, each in a separate journey. He never exited to Tan'eem for a second Umre during the same trip. The only instance of Umre from Tan'eem was when Hz. Peygamber instructed Aisha's brother to take her out to perform Umre because she had entered Hac without performing a separate Umre, and she was distressed about it. This was a specific case, not a general recommendation.
Sheikh Ibn Uthaymeen took a middle position, stating that performing Tavaf around the Kabe, praying in the Haram, reciting Kur'an, and making dhikr are better uses of time in Mekke than repeatedly exiting for additional Umres. He acknowledged the permissibility of repeated Umres but preferred focusing on other acts of worship that are more established from the Sunnah.