- Enable “Close all tabs” warning is a feature in Edge Canary 89.0.739.0
- Visit https://www.microsoftedgeinsider.com/en-us/download/
- Click Download under Canary Channel
- Once the download is completed you will find the updated version as 89.0.739.0
- Now open Edge browser and in the address bar type in or just copy-paste Edge://flags and hit the Enter key.
- Now search for Ask before closing multiple tabs
- Select enabled option from the drop down menu
- Click Restart button.
- Open Edge
- Click Settings
- Click Appearence. Here you will now find Ask before closing multiple tabs option. Just click on it to enable or disable it.
mceworld 
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