Storing configuration data on the NRF52840 SOC 1mb flash and Nordic's Peer Manager

We are using the NRF52840 BLE Module and currently on mbed-os 5.15.5 I believe and use the cordio platform to develop our BLE application. I was wondering is the peer manager enabled by default in the sdk.config for NRF52 targets? If so based on Nordics documentation, it seems like the Peer manager reserves some space on the non-volatile memory (1 mb Flash). Since we are planning to store some data on the flash we were hoping not get overwritten by the data that peer manager stores on the flash. Is there a way to find out what flash address range does the peer manager reserve to store data on the flash?

Thanks,
Ajay