Bonus Content automatically being on is correct, the mod unlocks it.I don't know if it is the walkthrough mod or something with the game, but when I play the game it says Bonus Content is On, even though I was never asked for the code, which is strange. I cannot click the little buttons to see the image like I am supposed to.
UPDATE: I see others having the game issue. I went to their Discord and wrote about it in the Bugs area. Hope it helps.
If you're referring to the circle with the arrow on it, and the red button on the top right of the screen, that is a bug in the game, not an issue with the mod.
I tried them with and without the mod