I can see it being set using dconf dump /:

[org/gnome/mutter]
attach-modal-dialogs=false
dynamic-workspaces=true
edge-tiling=true
experimental-features=['scale-monitor-framebuffer', 'variable-refresh-rate']
overlay-key='Super_L'
workspaces-only-on-primary=true

OK, so can anyone tell me why I'm getting the following when trying to build with staging-next? Trying to get latest Gnome 47 packages without waiting for everything to filter down to unstable...

       error: Package ‘apple-sdk-11.3’ in /nix/store/grs11qimnjqwk2ylkvl51w60d9jf5iqi-source/pkgs/by-name/ap/apple-sdk/package.nix:111 is not available on the requested hostPlatform:
         hostPlatform.config = "x86_64-unknown-linux-gnu"
         package.meta.platforms = [
           "x86_64-darwin"
           "i686-darwin"
           "aarch64-darwin"
           "armv7a-darwin"
         ]

Here's the full log:

error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:34:12:
           33|
           34|   strict = derivationStrict drvAttrs;
             |            ^
           35|

       … while evaluating derivation 'home-manager-generation'
         whose name attribute is located at /nix/store/grs11qimnjqwk2ylkvl51w60d9jf5iqi-source/pkgs/stdenv/generic/make-derivation.nix:336:7

       … while evaluating attribute 'buildCommand' of derivation 'home-manager-generation'
         at /nix/store/grs11qimnjqwk2ylkvl51w60d9jf5iqi-source/pkgs/build-support/trivial-builders/default.nix:59:17:
           58|         enableParallelBuilding = true;
           59|         inherit buildCommand name;
             |                 ^
           60|         passAsFile = [ "buildCommand" ]

       … while evaluating the option `home.activation.installPackages.data':

       … while evaluating definitions from `/nix/store/7zbmi61g4bq71j3ixy9b99cgg6yq95nc-source/modules/home-environment.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: Package ‘apple-sdk-11.3’ in /nix/store/grs11qimnjqwk2ylkvl51w60d9jf5iqi-source/pkgs/by-name/ap/apple-sdk/package.nix:111 is not available on the requested hostPlatform:
         hostPlatform.config = "x86_64-unknown-linux-gnu"
         package.meta.platforms = [
           "x86_64-darwin"
           "i686-darwin"
           "aarch64-darwin"
           "armv7a-darwin"
         ]
         package.meta.badPlatforms = [
           {
             cpu = {
               bits = 32;
             };
           }
         ]
       , refusing to evaluate.

       a) To temporarily allow packages that are unsupported for this system, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowUnsupportedSystem = true; }
       in configuration.nix to override this.

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowUnsupportedSystem = true; }
       to ~/.config/nixpkgs/config.nix.