You need to explicitly enable centralized routing at the tenant VRF level to override the default distributed routing behavior.
Therefore, a given tenant can have multiple VRFs with some VRFs operating in distributed routing mode and some VRFs operating in centralized routing mode.
To enable centralized routing on Tenant VRF, run the following command during VRF Create:
efa tenant vrf create --name <vrf-name> --tenant <tenant-name>
--routing-type {centralized | distributed}
--centralized-router <list-of-border-leaf-routers>
Example
efa tenant vrf create --name VRF1 --tenant tenant1
--routing-type centralized --centralized-router BL1-IP,BL2-IP