How can stop change automatically (increase the size) for the mouse pointer size ?

Hi! This usually happens in Windows when the mouse pointer personalization settings don’t get applied correctly at startup, or when Ease of Access / Accessibility settings conflict with system theme settings.

1. Press Win + R, type main.cpl > press Enter.
2. Go to the Pointers tab.
3. Pick a scheme (e.g., "Windows Default (system scheme)").
4. Click Apply > OK.

If that doesn´t work, try this:

1. Press Win + R, type regedit.
2. Navigate to: HKEY_CURRENT_USER\Control Panel\Cursors
3. Look for unusual entries for Scheme Source or custom cursor sizes.
4. Reset to defaults if needed (after exporting a backup of the key).

Hi Tony Nabil Habib,

Thank you for reaching out Microsoft Q&A regarding the issue with the mouse pointer size increasing automatically upon startup. I understand how frustrating this can be, and I appreciate your patience.

Below are some additional steps you can follow to help resolve the issue:

Step 1: Check Display Scaling

1. Go to Settings → System → Display.
2. Under Scale and layout, ensure the scaling is set to 100%.
3. If it’s set to a higher value (e.g., 125% or 150%), try adjusting it to 100% and restart your computer.

Step 2: Clear Cursor Cache

1. Open File Explorer.
2. Navigate to C:\Windows\Cursors.
3. Delete any custom cursor files you don’t recognize.
4. Restart your computer.

Step 3: Test in a New User Profile

1. Go to Settings > Accounts > Other users. 
2. Click Add account → choose Add a user without a Microsoft account. 
3. Enter a username and password → click Next. 
4. Sign out and log in to the new account to check if the pointer size behaves normally in the new profile.  For more detailed instructions, please refer to the official Microsoft support page at: How to create a Local account in Windows 11 - ARTICLE - Microsoft Q&A 

If the issue persists after trying these steps, please let us know and we’ll be happy to assist further.

it didn't solve the problem, please advice

Hi Tony Nabil Habib,

Thanks for your update. In this case as the issue with the mouse pointer size or rendering still persists, here are a few additional steps that we can try:

1. Update Graphics Driver Outdated or incompatible graphics drivers can affect how the pointer and UI elements are rendered.
   • Visit your graphics card manufacturer’s website (e.g., Intel, AMD, NVIDIA).
   • Download and install the latest graphic driver for your system.
   • Restart your computer after installation.
2. Run System File Checker This tool checks for and repairs corrupted system files that may be affecting pointer behavior.
   • Open Command Prompt as Administrator.
   • Type: sfc /scannow and press Enter.
   • Let the scan complete and follow any prompts.
   • Restart your device to apply changes then check again.
3. Check for Conflicting Software Some third-party tools (e.g., cursor enhancers, screen recorders, accessibility apps) can override pointer settings.
   • Try disabling or uninstalling any such tools.
   • You can also test in Safe Mode to see if the issue persists without third-party interference:
   1. Press Win + I → go to System > Recovery.
   2. Under Advanced startup, click Restart now.
   3. On the blue screen, choose Troubleshoot > Advanced options > Startup Settings.
   4. Click Restart, then press 4 for Safe Mode or 5 for Safe Mode with Networking.
4. Adjust High DPI Settings (for high-resolution displays) If the pointer appears oversized or blurry in specific apps:
   • Right-click the app icon → Properties → Compatibility tab.
   • Click Change high DPI settings.
   • Enable Override high DPI scaling behavior and set it to System (Enhanced).
   • Click OK and restart the app

Let me know if you'd like help walking through any of these steps or if the issue continues after trying them. I'm always here to support.