How to disable RTOS?

Thank you for your answer, but even if I use blank project with settings of "Hello world small" - size of the program is 4.5k. I think size of the blank program shoud be less than 1k. For our development, size is an important thing, because we also use several Nios-processors, based on 1 FPGA.

I tried to compile blank program, something like this:

void main() {}; //without any includes

but HAL-libraries were included in Makefile, and size of program in .elf file isn't changed (4.5k).

Can I exclude HAL from my project completely to minimize size of the program?