Solution
This behavior can occur due to a corrupted UI layout state or an issue with how Nigel is integrated into the TestStand environment.
To resolve the issue, reinstall Nigel to refresh its integration with TestStand:
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Open NI Package Manager.
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In the Installed tab, search for Nigel AI, then select all the related products and click Remove.
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Follow the steps shown in NI Package Manager to uninstall Nigel AI completely, ensuring all its components are removed.
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Reinstall Nigel AI Integration, making sure its version matches the TestStand version you're using, and all required dependencies are included.
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Reboot your computer to finish the installation, then launch TestStand again and verify that the Nigel login panel appears correctly.
After reinstalling Nigel, the UI behavior should no longer occur.