Agile scaling has a deep impact on the organization's structure and the collaboration of employees. Therefore, it is important to first clarify which goal you are pursuing and which problem you want to solve.
The Scaled Agile Framework (SAFe) and Large Scale Scrum (Less) are currently the best known concepts for agile development in large projects. Both are excellent suited to support large development organizations on their way to agility.
We are happy to support you with these questions, please contact us.