How to turn off notifications from Oracle Expenses? And removing Expenses interface screen?

Hi, I have 2 questions:

1. Is there a way to turn off all Expense notifications for users who submit expenses? (both email and bell notifications in Fusion)
2. Is there a way to remove access to the Expenses screen or creating Expense reports for certain users? I don't think we could remove the expenses role from the user as reports would be created in the background via delegated users.