Keyboard Shortcut Issue

What follows is was an AI / LMM has suggested

Do not take AI / LMM as an authoritative source of reliable information 

It is Only a Tool 

Proceed with caution

Apple's current macOS documentation identifies Command-S (⌘S) as the standard shortcut for saving the current document. Apple: Mac keyboard shortcuts

Because you previously assigned ⌘S to Siri, removed that shortcut in System Settings, and ⌘S still activates Siri, I would check the problem in this order.

First, open System Settings >> Keyboard >> Keyboard Shortcuts. 

Check App Shortcuts and any Siri-related shortcut settings. If you see a custom shortcut involving ⌘S, remove it. Then test ⌘S in Pages.

If no such shortcut is present, check Siri's stored preferences. 

Open Terminal and enter: defaults read com.apple.Siri

This command only reads the preferences; it does not change them.

Look for: CustomizedKeyboardShortcutSAE and KeyboardShortcutSAE

Below is by using the suggested command above 

defaults read com.apple.Siri

{

    ConfirmSiriInvokedViaEitherCmdTwice = 0;

    ContinuousSpellCheckingEnabled = 0;

    GrammarCheckingEnabled = 1;

    QueryHistory =     (

        "time in UK",

        "time in ik",

        "time mumbai",

        "time in mumbai"

    );

    StatusMenuVisible = 1;

    VoiceTriggerUserEnabled = 0;

If either entry appears, do not delete anything yet. 

Copy the relevant portion of the Terminal output and provide it here. We can then determine whether it contains the old ⌘S assignment.

A recent macOS 27 user report describes a Siri keyboard shortcut continuing to operate after it had been removed from System Settings and identifies these preferences in connection with the problem. 

The proposed Terminal procedure in that report is a user-reported workaround, not an Apple-documented fix. macOS 27 user report

I would not delete the Siri preferences, reset Siri, or change additional keyboard shortcuts yet. 

The defaults read result will tell us whether the relevant preference is actually present before we make a change.

If you paste the output from: defaults read com.apple.Siri

We maybe able identify the relevant entries and give you the next step.

To resolve a keyboard shortcut conflict on your Mac, change or disable the conflicting key combination in System Settings.

How to Change System Shortcut Conflicts

• Open the Apple menu and select System Settings.
• Click Keyboard in the sidebar.
• Click Keyboard Shortcuts.
• Select a category on the left (such as Spotlight, Mission Control, or Services) to find the overlapping key combination.
• Double-click the shortcut you want to modify (at the right side of the line)
• Press your new key combination or turn the shortcut off by unchecking it. 

Alternatively, on the relevant settings sub-pane click the Restore Defaults button at the bottom to cancel out all the customizations.

More info from Apple: Change a conflicting keyboard shortcut on Mac – Apple Support

Fixing Third-Party App Conflicts

If you are using any 3rd party keyboard managers, that may cause issues with conflicting shortcuts.

• macOS system settings only detect built-in shortcuts and ignore clashes caused by external tools like Raycast, BetterTouchTool, or Karabiner.
• If two utility programs fight over the same hotkey, use a diagnostic tool like HotkeyClash to scan and reveal which app currently claims the combination.
• Alternatively, open the settings of your third-party applications to manually reassign their conflicting hotkeys.

I would have though that removing the keyboard shortcut would be enough, since it usually is.

The next best thing is to try and assign a different shortcut. Does that also not work?

Note: you could of course restore defaults, as suggested; but that will forget all other custom shortcuts that you may have.

Thank you all for your suggestions. I have solved the problem with reseting the keyboard shortcuts for Siri. Now when I save a Pages document with Command + S, it saves the document instead of opening Siri. All is well.