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Why can't I use 'open message in conversation' anymore?

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Upgraded Thunderbird yesterday because it said I should. But noticed today that new messages do not have Open Message in Conversation.

The only add-on I have is Lightning. Disabled it and restarted thunderbird, no joy.

Upgraded Thunderbird yesterday because it said I should. But noticed today that new messages do not have Open Message in Conversation. The only add-on I have is Lightning. Disabled it and restarted thunderbird, no joy.

Chosen solution

Actually found this prior solution: https://support.mozilla.org/en-US/questions/992811#answer-551695

Turns out it was the "Reset toolbars and controls" in addition to "disable all addons" and TWO restarts of Thunderbird that resolved it. Then re-enabled Lightning and all is well.

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Chosen Solution

Actually found this prior solution: https://support.mozilla.org/en-US/questions/992811#answer-551695

Turns out it was the "Reset toolbars and controls" in addition to "disable all addons" and TWO restarts of Thunderbird that resolved it. Then re-enabled Lightning and all is well.