The mod (created by user Wofsgeg and maintained by a dedicated community of contributors) is a user-made modification available via the Steam Workshop.
If you install the Item Description Mod and nothing happens, try these fixes: item description mod isaac repentance
Allows you to customize EID settings (like text size and transparency) by pressing "Spoiler Free" Mode In the EID settings, you can set "Hide uncollected items" The mod (created by user Wofsgeg and maintained