Hello Yash,
Answer to 1st Question -->In Azure DevOps (ADO), you cannot apply the same viewing restrictions for Dashboards, Repos, Pipelines, and Test Plans from the organization settings. Each of these features has its own permission model and management interface. While some overarching organization-level settings might influence access, specific viewing restrictions are typically managed at the project or feature level
Answer to 2nd Question --> Yes, organization-level project visibility settings can override project-level access — but only for the visibility of the project itself, not its internal components.
Ref -->https://learn.microsoft.com/en-us/azure/devops/organizations/security/about-permissions?view=azure-devops&tabs=preview-page & https://learn.microsoft.com/en-us/azure/devops/organizations/security/access-levels?view=azure-devops
Pls check and let me know if any futher
Thanks
Deepanshu