Custom keymap + Default (on comments below). Better safe than sorry.

keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

    [0] = LAYOUT(
      KC_ESC,   KC_F1,    KC_F2,    KC_F3,    KC_F4,    KC_F5,    KC_F6,    KC_F7,    KC_F8,    KC_F9,    KC_F10,   KC_F11,   KC_F12,   KC_PSCR,  KC_INS,   KC_DEL,
      KC_GRV,   KC_1,     KC_2,     KC_3,     KC_4,     KC_5,     KC_6,     KC_7,     KC_8,     KC_9,     KC_0,     KC_MINS,  KC_EQL,   KC_DEL,   KC_BSPC,  KC_HOME,
      KC_TAB,   KC_Q,     KC_W,     KC_E,     KC_R,     KC_T,     KC_Y,     KC_U,     KC_I,     KC_O,     KC_P,     KC_LBRC,  KC_RBRC,  KC_BSLS,            KC_PGUP,
      KC_CAPS,  KC_A,     KC_S,     KC_D,     KC_F,     KC_G,     KC_H,     KC_J,     KC_K,     KC_L,     KC_SCLN,  KC_QUOT,                      KC_ENT,   KC_PGDN,
      KC_LSFT,  MO(1),    KC_Z,     KC_X,     KC_C,     KC_V,     KC_B,     KC_N,     KC_M,     KC_COMM,  KC_DOT,   KC_SLSH,  KC_RSFT,            KC_UP,    KC_END,
      KC_LCTL,  KC_LGUI,  KC_LALT,                      KC_SPC,   KC_SPC,   KC_SPC,                       KC_RALT,  MO(1),    KC_RCTL,  KC_LEFT,  KC_DOWN,  KC_RGHT
    ),

    [1] = LAYOUT(
      _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,
      _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  RESET,    KC_MPLY,
      _______,  _______,  KC_UP,    _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            _______,
      _______,  KC_LEFT,  KC_DOWN,  KC_RGHT,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,                      _______,  _______,
      _______,  _______,  RGB_TOG,  RGB_MOD,  RGB_HUI,  RGB_HUD,  RGB_SAI,  RGB_SAD,  RGB_VAI,  RGB_VAD,  _______,  _______,  _______,            KC_VOLU,  KC_MUTE,
      _______,  _______,  _______,                      _______,  _______,  _______,                      _______,  _______,  _______,  KC_MPRV,  KC_VOLD,  KC_MNXT
    ),

    // DEFAULTS
    // [0] = LAYOUT(
    //   KC_ESC,   KC_F1,    KC_F2,    KC_F3,    KC_F4,    KC_F5,    KC_F6,    KC_F7,    KC_F8,    KC_F9,    KC_F10,   KC_F11,   KC_F12,   KC_PSCR,  MO(1),    KC_DEL,
    //   KC_GRV,   KC_1,     KC_2,     KC_3,     KC_4,     KC_5,     KC_6,     KC_7,     KC_8,     KC_9,     KC_0,     KC_MINS,  KC_EQL,   KC_DEL,   KC_BSPC,  KC_HOME,
    //   KC_TAB,   KC_Q,     KC_W,     KC_E,     KC_R,     KC_T,     KC_Y,     KC_U,     KC_I,     KC_O,     KC_P,     KC_LBRC,  KC_RBRC,  KC_BSLS,            KC_PGUP,
    //   KC_CAPS,  KC_A,     KC_S,     KC_D,     KC_F,     KC_G,     KC_H,     KC_J,     KC_K,     KC_L,     KC_SCLN,  KC_QUOT,                      KC_ENT,   KC_PGDN,
    //   KC_LSFT,  MO(1),    KC_Z,     KC_X,     KC_C,     KC_V,     KC_B,     KC_N,     KC_M,     KC_COMM,  KC_DOT,   KC_SLSH,  KC_RSFT,            KC_UP,    KC_END,
    //   KC_LCTL,  KC_LGUI,  KC_LALT,                      KC_SPC,   KC_SPC,   KC_SPC,                       KC_RALT,  MO(1),    KC_RCTL,  KC_LEFT,  KC_DOWN,  KC_RGHT
    // ),

    // [1] = LAYOUT(
    //   _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,
    //   _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  RESET,    _______,
    //   _______,  RGB_TOG,  RGB_MOD,  RGB_HUI,  RGB_HUD,  RGB_SAI,  RGB_SAD,  RGB_VAI,  RGB_VAD,  _______,  _______,  _______,  _______,  _______,            _______,
    //   _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,                      _______,  _______,
    //   _______,  _______,  _______,  _______,  BL_DEC,   BL_TOGG,  BL_INC,   BL_STEP,  _______,  _______,  _______,  _______,  _______,            _______,  _______,
    //   _______,  _______,  _______,                      _______,  _______,  _______,                      _______,  _______,  _______,  _______,  _______,  _______
    // ),
};

// Enable an uniform white light when CAPS LOCK is on
extern rgblight_config_t rgblight_config;

uint32_t mode;
uint16_t hue;
uint8_t sat;
uint8_t val;

void led_set_user(uint8_t usb_led) {
  if (usb_led & (1<<USB_LED_CAPS_LOCK)) {
    rgblight_mode_noeeprom(RGBLIGHT_MODE_SNAKE + 5);
    rgblight_sethsv(0, 0, 100);
  } else {
    rgblight_mode(RGBLIGHT_MODE_RAINBOW_SWIRL + 5);
    rgblight_sethsv(120, 100, 100);
  }
}