Hi @W R ,
Navigate to edge://settings/clearBrowsingDataOnClose and check if turn on the option Browsing history.
If you didn't enable this option, you should be able to find them in your browsing history and restore them. Just use the shortcut key Ctrl+Shift+T. You can press as many as you can until your desired tabs are restored.
Unfortunately, there's no feature yet to restore tab groups as a whole. Also, it would be better to set your Edge to pick up where you left off when Edge starts. Go to Settings > Start, home, and new tabs > and set the option to "Open tabs from the previous session"
And also, I suggest using Collections or Favorites to save all the tabs that you'd like to reopen next time, and they won't get lost.
Thanks for your cooperation.
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Regards,
Wenying Lu