f the Microsoft Edge Engineer Devices window stays clear or shows no happy, there could be a few purposes behind this issue. You can try the following troubleshooting steps to fix the issue:
Update Microsoft Edge: Ensure you are utilizing the most recent rendition of Microsoft Edge. Refreshes frequently incorporate bug fixes and enhancements that can determine similarity issues with the Designer Instruments.
Start up Microsoft Edge again: Restart Microsoft Edge after closing all instances. In some cases, a basic restart can determine impermanent errors.
Clear Program Store: Any corrupted or out-of-date data that might be causing the problem can be eliminated by clearing the browser's cache. To clear the cache, navigate to the browser's settings and select either the "Clear browsing data" or "Clear cache" option.
Turn off Extensions: Developer Tools functionality may be compromised by some browser add-ons or extensions. Disable any extensions you have installed for a short time, then check to see if the Developer Tools window starts showing content.
Check the settings of Developer Tools: To access the settings, open the Developer Tools and select the gear icon or menu with three dots. Check to see that "Enable CSS" and "Enable JavaScript" are both turned on.