As stated, this value represents the default behavior only, while a user with a Deployer (or above) role can override it upon creation of an environment.
NoteThe default auto-approve value for every consecutive deployment to an existing environment is defined based on the last deployment, and not by its project’s default auto-approve setting.For example, if I deploy the Production environment with auto-approve as OFF, although my default project settings is ON, my next deployment would still have a default OFF value for auto-approve.

Next steps
- Policies - Review available project-level policies.
- Approval Policies - Require explicit approval before deployments apply.
- Creating a New Environment - Create environments that inherit project policies.