Hi Jennifer,
This is a difficult question to answer without much context. There are ways to "customize" what your users and PMs see within a project plan; as example, you could create a unique view so they see only tasks fields that are necessary. Within those users layout template you could set this view for them, in addition, within the layout template you can identify the most useful items on the left hand panel for them to use and remove anything else that is not necessary. You can show the Gantt/timeline view with the click of a button inside of your project plan, if that is a need. Happy to provide more ideas if you have more context.
