What is the ruling on the posters hung in mosques that contain the supplications after prayer, from which the worshiper reads after prayer?

It is preferable to recite the post-prayer remembrances (dhikr) from memory, as this leads to better contemplation (tadabbur) and devotion (khushu'), and aligns with the practice of the predecessors (Salaf). However, there is no harm in reading them from a paper for those who have not memorized them. Similarly, there is no objection to placing stickers containing these remembrances on the mosque walls to remind the worshippers, provided that they do not distract or disturb them during prayer.