Keychron K0 Max RGB Layer Color for KeyMap Example

bool rgb_matrix_indicators_advanced_user(uint8_t led_min, uint8_t led_max) {
    for (uint8_t i = led_min; i < led_max; i++) {
        switch(get_highest_layer(layer_state|default_layer_state)) {
            case FN:
                rgb_matrix_set_color(i, RGB_WHITE);
                break;
            case L3:
                rgb_matrix_set_color(i, RGB_BLUE);
                break;
            case L2:
                rgb_matrix_set_color(i, RGB_RED);
                break;
            case L1:
                rgb_matrix_set_color(i, RGB_YELLOW);
                break;
            default:
                rgb_matrix_set_color(i, RGB_OFF);
                break;
        }
    }
    return false;
}