What This Error Means Windows is warning you that your display scaling is set to a non-standard value. Display scaling controls how large text, apps, and other items appear on your screen. While Windows recommends specific scaling values (like 100%, 125%, 150%, etc.), sometimes custom values get set (like 117% or 133%).

Why This Matters

App Compatibility: Some applications may appear blurry or incorrectly sized with custom scaling
Display Issues: You might see graphical glitches or improperly aligned windows
Performance: Non-standard scaling can sometimes impact performance

Detailed Fixes

Method 1: The Simple Solution (Best for Most Users)

Click "Turn off custom scaling and sign out" (as shown in your screenshot)
Windows will: Reset scaling to the recommended value (100% in your case) Sign you out to apply changes
Simply sign back in - your display will now use standard scaling

Method 2: Manual Adjustment

Under "Change the size of text, apps, and other items": Select the dropdown menu Choose "100% (Recommended)" (or another standard option like 125% if you prefer)
Click "Apply"
Restart your computer to ensure all applications recognize the change

Method 3: Advanced Scaling Settings

If 100% feels too small but you want to avoid custom scaling:

Click "Advanced scaling settings"
Enter a standard value (like 125%)
Click "Apply"
Sign out and back in

Prevention Tips

Avoid using third-party tools that modify display settings
When connecting external monitors, let Windows set the recommended scaling first
Update your graphics drivers regularly

When You Might Want Custom Scaling

The only time you'd want to keep custom scaling is if:

You have very specific vision needs
You're using an unusual display setup
A particular application requires it

For most users, sticking with the recommended scaling values (100%, 125%, 150%, etc.) provides the best experience.

Understanding and Fixing the "A Custom Scale Factor is Set" Error in Windows