Linker file in Mbed Studio

I am compiling a simple Blinky Mbed program in DISCO-H747I using Mbed Studio IDE. This is a dual core processor and by default setting it uses core M7. Now, I want to change the core M7 to core M4 and I am having problem changing the default core.
If I am correct, the location of the core .sct has to be changed in linker file but the problem is that I cannot even find the location of the linker file.
If I am not correct, then could somebody suggest me the correct way to change the default M7 core to M4 core.