NRF52832 Maximum number of central links

HI, I found that the maximum number of connections 52832 can only be 15 connections, like this

// <o> NRF_SDH_BLE_CENTRAL_LINK_COUNT - Maximum number of central links. 
#ifndef NRF_SDH_BLE_CENTRAL_LINK_COUNT
#define NRF_SDH_BLE_CENTRAL_LINK_COUNT 15
#endif

When I set up more than 15 when the compiler will be wrong, I would like to know what method can set the maximum number of links to 20

I am using the example is :

nRF5_SDK_14.1.0_1dda907\examples\ble_central\ble_app_multilink_central\pca10040\s132\arm5_no_packs