qmk-keychron-q3-colemak-dh/keyboards/dz60/keymaps/iso_4th_row_all_1u/keymap.c

#include QMK_KEYBOARD_H

// LAYERS
#define _QWERTY 0      // QWERTY layer
#define _QW _QWERTY

#define _FUNCTION 1    // Function layer
#define _FN _FUNCTION

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

  [_QWERTY] = LAYOUT_60_iso_4th_row_all_1u(
    //       2        3        4        5        6        7        8        9        10       11       12       13       14       15       16
    QK_GESC, 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_BSPC,
    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,
    MO(_FN), KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,
    KC_LSFT, KC_NUBS, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_INS,  KC_UP,   KC_DEL,
    KC_LCTL, KC_LGUI, KC_LALT,                   KC_SPC,                                      KC_CAPS, MO(_FN), KC_LEFT, KC_DOWN, KC_RGHT
  ),

  [_FUNCTION] = LAYOUT_60_iso_4th_row_all_1u(
    //       2        3        4        5        6        7        8        9        10       11       12       13       14       15       16
    KC_GRV,  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_DEL,
    _______, XXXXXXX, KC_UP,   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, KC_PSCR, XXXXXXX, XXXXXXX,
    _______, KC_LEFT, KC_DOWN, KC_RGHT, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
    _______, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, KC_MPRV, KC_MNXT, KC_MUTE, KC_VOLD, KC_VOLU, KC_MPLY, XXXXXXX, KC_PGUP, XXXXXXX,
    XXXXXXX, XXXXXXX, XXXXXXX,                   XXXXXXX,                                     XXXXXXX, _______, KC_HOME, KC_PGDN, KC_END
  ),
};