Depending on the permissions the account admin provided, you may be restricted from viewing certain information for contacts, companies, and deals. Feel free to reach out to your account administrator if you feel this was done in error.
Contacts and Companies
You are only able to view the contacts and companies where you are listed as a sales rep.
If you don't own any contacts or companies, you might see "Sorry, but your search produced no results" on the contact and company list views
Deals
You can still see the number of total deals and their estimated worth.
You can only view deals where you are the sales rep.
You cannot click into any deals that are owned by others.