Were the first humans tall?
The Quran doesn’t say anything about the height of the first humans or Adam. The Quran wants to see from humans how Allah began the creation (al-Ankabut  19). According to the Quran everything in the universe is also a sign/evidence of Allah (adh-Dhariyat  20; Fussilat  53).
The knowledge that Adam’s height was 60 Dhira (approximately 36 meter) bases on narrations (Hadith, Bukhari, Anbiya 1, 2; Muslim, Jannah 28 (2841).
Cambridge University says that remains of the first human shows us, that they were short: Australopithecus afarensis (4 million to 3 million years; ~40 kg, 130 cm).
Therefore, according to the Quran or in the evidence of Allah in the universe, the first humans weren’t tall.
Source of the remaingns: https://www.newsweek.com/early-humans-became-tall-and-thin-15-million-years-ago-survive-outside-forest-705678