Is the colored Tajweed Qur’an, with its colors, squares, and spaces for pauses, considered an innovation (bid‘ah)?

There is no objection to using a colored Tajweed Mushaf (Qur'an), rather it facilitates learning Tajweed. It has been permitted by the Islamic Research Academy at Al-Azhar, the Shaykh of the Reciters of Al-Sham, and Wahbah Al-Zuhayli, who cited the verse: ﴿And We have certainly made the Qur’an easy for remembrance﴾. Al-Zuhayli is of the view that any method which facilitates the knowledge and adherence to Tajweed rulings is permissible according to Sharia, just as the colors do not contradict the transmitted script. The use of these colors is not considered an innovation (bid'ah), as early scholars ofضبط (Qur'anic orthography) during the time of the Tabi'un (successors) used to vocalize and dot the Mushafs with red ink. Ibn Taymiyyah mentioned that the Companions did not dot the Mushafs because they were Arabs, and then the Tabi'un began vocalizing and dotting them with red ink. Shaykh Abdullah Al-Mutlaq clarified that dots, vowels, nunation, and the signs of Tajweed, joining, and stopping were not part of the original Uthmani script, but were added later to facilitate reading.