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where is 'back' arrow when text disappears?

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When I am writing an email, I sometimes go to correct something or alter and whole lines disappear [guess I must touch something to make that happen?] but I used to use 'incredimail' and if this did happen there was arrow 'forward' and arrow back so it made the sentence come back into my email again. How do I get this function using Thunderbird, if available? Thanks,

Von
When I am writing an email, I sometimes go to correct something or alter and whole lines disappear [guess I must touch something to make that happen?] but I used to use 'incredimail' and if this did happen there was arrow 'forward' and arrow back so it made the sentence come back into my email again. How do I get this function using Thunderbird, if available? Thanks, Von

被選擇的解決方法

control+z is the shortcut for Edit-Undo

從原來的回覆中察看解決方案 👍 2

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選擇的解決方法

control+z is the shortcut for Edit-Undo

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Thank you for your time, will try this next time it happens! No idea how everyone knows this stuff except me!! Von

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Both of these actions work in most software so it is not just a Thunderbird thing.