Thank you for your feedback. According to Microsoft's official support notes, if you successfully install this update, your computer version will be updated to 22631.3374.
You can check your PC version by the following method. Press win+r and type:
winver
if the version is 3374 after that means you have successfully installed the update, just because the display bug can not be displayed, does not affect your use.
March 26, 2024—KB5035942 (OS Builds 22621.3374 and 22631.3374) Preview - Microsoft Support
If it did not install successfully, you can try to install the update manually by following the link below.
Enter the number of the update, and then select the model number of your computer.
Please let me know if you have any other questions or if I haven't explained something clearly.
Best Regards,
Aaron- MSFT | Microsoft Community Support Specialist