Awakening of Evil

This is some game setting that disables "arena" objects; it was mentioned in the editor's manual. I can't remember exactly where to find it now.

Thank you! I found the following phrase in the manual:
"Attention! There are objects in the ‘Arena Objects’ category that will become invisible in the game
when the player activates the ‘No Eyecandies’ option!"

As I understand it, in the Russian version, this setting is called "Simplified Display."
BUT!
This option seems to be saved in the save file at the beginning of the game, and changing it later has no effect.
To test this, I started the first mission from scratch with this option disabled. I quickly ran to the exit to the surface – and voilà, birds are flying above the exit. However, in the main saved game, there are no animations.
And no matter how I change this option in the settings afterward, when I load the test save, the birds are flying, but when I load the main save, they are not.

Is it possible to fix the save file and restore the animations? I really don't want to replay the first mission and the second mission's labyrinth again :(

I would also like the author to clearly state in the header: "You must start the campaign with the "Simplified Display" option disabled; otherwise, some quest objects will not be visible."