How BOOT and APP use the RAM area independently?

Hi, Everyone!

IDE: CS+ for CA,CX V4.02.00;  MCU: RL78F12;

I created two BOOT and APP subprojects in a project according to the "B.3.5 Boot-flash relink function" method in the RL78, 78K0R Build User's Manual.When I bulid the project, I found that BOOT and APP shared RAM.

My question is:

The RAM used by BOOT can be released after entering the APP. How can I tell the IDE: Let a piece of RAM be used by the BOOT and let the APP use it?