In reply to @jeff:ocjtech.us
Is NixOS staying with GTK 4.12 because it hasn't updated to Gnome 46 yet?

{
  services.xserver = {
    enable = true;
    libinput.enable = true;
    xkb = {
      options = "ctrl:nocaps";
      layout = "us";
    };
    displayManager = {
      defaultSession = "gnome";
      startx = {
        enable = false;
      };
      gdm = {
        wayland = true;
        enable = true;
      };
      sddm = {
        enable = false;
      };
    };

    desktopManager = {
      xterm.enable = false;
      xfce.enable = false;
      gnome.enable = true;
    };
    videoDrivers = [ "amdgpu" ]; # "nvidiaLegacy390" ];
  };
  xdg.portal = {
    enable = true;
    configPackages = [ pkgs.gnome.gnome-session ];
    extraPortals = with pkgs; [ xdg-desktop-portal-wlr ];
  };

  # required for non-GNOME systems
  services.dbus.packages = [ pkgs.gcr ];

  programs.evince.enable = true;


  services.gnome.core-shell.enable = true;
  services.gnome.core-os-services.enable = true;
  services.gnome.tracker-miners.enable = false;
  services.gnome.tracker.enable = false;
  services.gnome.gnome-keyring.enable = true;
}

In reply to @abbe:badti.me
I recently decided to try GNOME on NixOS (already using it with sway for some time now), and I noticed apps installed through home-manager are not showing up in Applications. While the same apps show up fine in Fuzzel menu in Sway.