Increasing the number of rak'ahs (units of prayer) in Taraweeh prayer is a voluntary practice observed by many Muslims during the month of Ramadan. While the obligatory night prayer (Isha) consists of four rak'ahs, Taraweeh is typically performed with additional rak'ahs, depending on local customs and personal preferences.
Sh. Ṣāliḥ al-Fawzān حفظه الله إيمانه mentioned while commenting on Shaykh al-Islām's رحمه الله statement concerning al-Tarāwīḥ: "Whoever thinks that the standing in prayer in Ramaḍān has a specified number from the Prophet ﷺ, which is not to he increased upon or decreased from has without doubt erred.
This is clear, and it is not befitting to have discord concerning these issues, to such an extent that some of them say that increasing upon eleven or thirteen rak'āt is a bid'ah (innovation)! Then this means that 'Umar and the Companions practiced bid'ah.
The Prophet ﷺ did not specify the number of rak'āt for al-Tarāwīḥ. Rather, he stated: "Whoever stands in prayer in Ramaḍān out of faith and seeking the reward (for such) will have his preceding sins forgiven. And he said: "Whoever stand in prayer with the Imām until he finishes and leaves the prayer will have an entire night in of prayer written for him."
He ﷺ did not specify, and harshness in this issue and the absence of understanding theses issues is what causes reckless speech.
The Prophet ﷺ stated: "It is obligatory upon you to adhere to my Sunnah and the Sunnah of the Righteous Caliphs.' And 'Umar is the second Caliph and the Companions along with him prayed twenty-three rak'āt in the Masjid of the Prophet ﷺ."
All praise is due to Allah we ask Him to bless the Prophet Sallah Llah Alei Wasalam and let us die on the path of Qur'an and Sunnah.