Read this. Basically you will need to create a relation from your items to an admin sheet using a Relation and Lookup to get a list of emails that have access to the switch. Then set visibility to only show when the signed in user is in the lookup.
Read this. Basically you will need to create a relation from your items to an admin sheet using a Relation and Lookup to get a list of emails that have access to the switch. Then set visibility to only show when the signed in user is in the lookup.