I have several projects in my dashboard of an old company. However, I am as an "editor". Someone could tell me how to remove these projects from my dashboard. thanks
You cannot remove or unlink those projects if you are holding an Project Editor position, only the Project Owner can remove you from the project or a user that have a role of Project IAM Admin.
The best way to do is to ask the owner or the IAM Admin of the project and request that they remove you from their projects.