Added my own option under Writing posts options but it still showing

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Hello, im using the WordPress Hide Posts plugin by MartinCV in my blog.
I would like to hide that section for Authors when writing posts.
With Firefox dev tools i used inspector to find class/id:

Hide Posts

Then under Adminimize Writing posts options i added new custom option with the value “whp_hide_posts” and checked the flag Disable for authors but the box is still showing when an author edit or create a new post.

Adminimize

I also tried to put “whp_hide_posts.postbox” as value but still doesn’t work, what im doing wrong?

Thanks in advice.