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Control line spacing

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Since my W7Pro OS was reinstalled, Thunderbird has been double spacing when I hit Enter. How can I return this to single spacing?






entrer






enter

Since my W7Pro OS was reinstalled, Thunderbird has been double spacing when I hit Enter. How can I return this to single spacing? entrer enter

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I'm not sure what caused all that space in your question, but I think it's the setting discussed in this thread:

Why does email double space every time I hit the return? https://support.mozilla.org/questions/1128494