Save as PDF Scaling Stopped Working

You're better off using "Microsoft Print to PDF" rather than MS Edge "Save to PDF"

Installing Microsoft Print to PDF in Windows 11/10

Method 1: Enable via Windows Features

1.    Press Win + R, type optionalfeatures, and press Enter.
2.    In the Windows Features dialog, locate Microsoft Print to PDF.
3.    If unchecked, select it and click OK to install.
4.    If already checked, uncheck it, click OK to uninstall, then repeat steps 1–3 to reinstall.
5.    Restart your PC and check if the printer is restored.

Method 2: Add Manually via Add Printer Wizard

1.    Press Win + R, type control printers, and press Enter.
2.    Click Add a printer and select The printer that I want isn’t listed.
3.    Choose Add a local printer and select the port FILE: (Print to File).
4.    Under Manufacturer, select Microsoft; under Printers, select Microsoft Print to PDF.
5.    Click Next, finish the wizard, and verify the printer appears in your list.

Method 3: Reinstall via Command Prompt

1.    Press Win + R, type cmd, then press Ctrl + Shift + Enter to run as administrator.
2.    Type net stop spooler and press Enter.
3.    Disable the feature: 

dism /Online /Disable-Feature /FeatureName:"Printing-PrintToPDFServices-Features" /NoRestart.

4.    Enable the feature: 

dism /Online /Enable-Feature /FeatureName:"Printing-PrintToPDFServices-Features" /NoRestart.

5.    Restart your PC and check the printer list.

Method 4: Restore via PowerShell

1.    Open PowerShell as administrator.
2.    Disable the feature: 

Disable-WindowsOptionalFeature -online -FeatureName Printing-PrintToPDFServices-Features.

3.    Enable the feature: 

Enable-WindowsOptionalFeature -online -FeatureName Printing-PrintToPDFServices-Features.

4.    Restart if needed and verify the printer is available.