Hello @Jason Hunter ,
Welcome to Microsoft Q&A forum.
Yes, the keyboard shortcut is Ctrl + E, T.
You can try to press Ctrl + E and then release them, after that press T, to open the Test Explorer window.
Update1:
Please confirm if the TestExplorer.ShowTestExplorer command has been assigned to Ctrl+E, T keyboard shortcuts in Tools > Options... > Environment > Keyboard > find and click to select the "Press shortcut keys:" box > press Ctrl+E, T on your keyboard > check the "Shortcut currently used by:" box.
If it was assigned, please double check if you press the keyboard shortcuts correctly => press Ctrl and E together, and then release them together, after that just press T and release it.
If it wasn't assigned, please try to type "TestExplorer.ShowTestExplorer" in "Show commands containing:" box, select it from the list and press the shortcut keys that you want in the "Press shortcut keys:" box and click the Assign button to assign this customized keys to this command. Check if it works.
Have a great day.
Sincerely,
Tianyu
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