Reply To: Learning during davening on Rosh Hashana

I do. It’s unclear how appropriate it is though. I try to read through all of the commentary and Halachos in the Artscroll Machzor before I actually open a different Sefer though. Also, it’s actually Assur if it will cause you to miss an Amen or cause other people to talk/read outside materials during Chazaras Hashatz.