For any object in an Org Model, open the tree and select a field. Select the "Field access by permission set/profile" tab on the right panel. Then click "Fetch field access data" to get the data.
You will get a notification when access details have been updated. You will see what profiles and permission sets (and how many) are associated with a given field.
The hyperlink icons will open the profile pages inside Salesforce Setup. If you roll over a listed profile or permission set you will see a popover with key metadata about it:
Click on the "Show users with access" text button at the top to see how many users have access to this field, as well as their access type.