Seems to be a GUI limitation. The settings schema allows for such shortcuts:
org.gnome.desktop.wm.keybindings move-to-workspace-1 ['<Super><Shift>Home'] org.gnome.desktop.wm.keybindings move-to-workspace-10 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-11 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-12 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-2 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-3 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-4 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-5 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-6 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-7 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-8 @as [] org.gnome.desktop.wm.keybindings move-to-workspace-9 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-1 ['<Super>Home'] org.gnome.desktop.wm.keybindings switch-to-workspace-10 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-11 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-12 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-2 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-3 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-4 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-5 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-6 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-7 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-8 @as [] org.gnome.desktop.wm.keybindings switch-to-workspace-9 @as [] ** Package changed: gnome-shell (Ubuntu) => gnome-control-center (Ubuntu) ** Changed in: gnome-control-center (Ubuntu) Importance: Undecided => Low ** Changed in: gnome-control-center (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1979999 Title: Number of "switch to workspace" shortcuts differs from actual number of workspaces To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1979999/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs