Adding entities in Model Driven Advanced Find Search (Like Advanced find shows all entities to search)

Hi All,

Dynamics CRM 365(Online) upgrade wave-1 has introduce Model Driven Advanced Find, When I am going to use it, I don't see all the entities listed there in search dialog.

Like System Job or custom entities, only few entities are there by default.

I read somewhere that its app specific and we have to modify app to add/remove entities in that dialog but there is no steps or documentation to Add entity in  Model Driven Advanced Find search.

Please help.

Thank you in advance