This had been answered by @Daniel Zhang-MSFT in thread : https://learn.microsoft.com/en-us/answers/questions/484439/visual-studio-forms-designer-wont-load-displays-th
All pages not showing How to fix it?
MUSTAFA mjh
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All forms have the same problem
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Jiachen Li-MSFT 33,541 Reputation points Microsoft Vendor
2025-02-28T01:49:05.5933333+00:00 Hi @MUSTAFA mjh ,
Try to restart or update your Visual Studio to the latest version.
Uninstall and reinstall the System.Configuration.ConfigurationManager package.
Best Regards.
Jiachen Li
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