Guess that you have a decent PC? I could be misremembering, but I suspect most of the complaints about overlay issues I've seen are related to low-spec PCs which can just about run the game—so any extras like Overlay, Discord etc could be enough to tip the balance sometimes.
I've used OneNote for that for years. Examples:
This is 3 screenshots of ON put together sideways. Partial menus from Strategy and Shooters sections, plus a page from Locations sub-page of Far Cry 6 page of Shooters section—incl screenie.
This of course suits me best, as I like to have info visible on a second monitor, and I frequently AltTab in and out of whatever games are currently in play.
I have a scrap page for holding temp stuff for a current quest—what you see above are notes I want to have available when I come to replay the game next year.