Hi

I'm the manager of the software department in our small company 

I created a view with some workpackages, scheduled the workpackages via the gantt charts. How can I lock the gantt charts so that the assignees can not mistakenly modify them?

I would solve this by giving them read only rights in the Members module of the project.

Thanks,

Can they then add comments to any issue/epic/us or task?

Hi Gerald, please refer to the documentation for further information: https://docs.openproject.org/system-admin-guide/users-permissions/roles-permissions/
You can define roles yourself.

Ok Thank you