Hi, quocvo142!
Thanks for reaching out to Microsoft Community and posting your concerns regarding the blurry text on small windows like notification pop-up and pop-up when downloading items. May I know if the issue started just recently? Any changes done on the device? Is there an external device connected?
In the meantime, please perform the steps below to troubleshoot the issue.
· Check for Windows Update:
Go to Settings > Update & Security > Windows Update > Check for Updates
Please restart your device to apply the updates.
· Run Surface Diagnostic Toolkit and make sure to complete the tasks.
· Force shutdown the device and restart.
- Press and hold the power button until the screen turns off (about 10 seconds), then release the power button.
- Press and release the power button to turn your Surface back on. You should see the Microsoft logo.
If that doesn't work, here's how to make sure your Surface turns off completely:
Press and hold down the power button until your Surface restarts and you see the Windows logo screen (this about 20 seconds), then release the power button.
Also visit this page to Fix apps that appear blurry in Windows 10.
If this answers your question, please let our Community know by marking this post as an answer. Otherwise, don't hesitate to respond to this thread if there’s anything else that needs to be addressed.
Kind regards,
Janette_Z