Mirage was carefully searching for the said small button and he indeed found it in no time, it was just on the lower side of the bookshelf which he could easily press if he just slightly move his foot.
He unhesitatingly pressed it using his foot and then he heard some mechanical clickings before a twenty-inches transparent white screen suddenly appeared in front of him.
He reached out for his hands and swiftly browsed through the screen to find out its uses.
A few seconds had only passed when Mirage had already mastered its only functions, they're really few and the user only had to choose some tags that they want to filter for example:
If the user wanted to search for a three-star spell that he could learn, he would only just have to choose the [ 3-star ] and [ Could be Learned ] buttons.