What is the use of feature opt in "Legal Entity-Based Data Access for Bank Account Set" under CM?

Query is regarding the feature opt in available under Cash management : “Legal Entity-Based Data Access for Bank Account Setup”, Currently in our project we have bank accounts secured at user level. But we wanted to understand if this feature is opted in how will create an impact? Will the existing bank account security get override? What is the exact functionality behind this feature?

Please note that we have already gone through the Oracle docs and followed the same approach but still not able to figure the exact functionality. Here is the link (https://docs.oracle.com/en/cloud/saas/human-resources/23d/fapid/considerations-when-you-create-accounts.html#s20029797)