Remove Read and manage mailbox Permission

Hi,

I have a few questions,

as a user how can I know that someone has the Permission to read and manage my mailbox? Is there a way to remove it?

as an Admin how can I cancel the permission for other admins without removing the admin role?

if I have to change the role which role should I use?

P.S: I don't want to cancel administrators' access I want to remove the ability to give read and manage permissions.

Thank you.