Off Cntl + one by chance, how I turn it back on

We can highlight all emails in undesirable say for example and delete them at once or just drag and drop them in a chosen place. I have managed to disable this shortcut very useful and can not find where I did. can someone tell me where to go to turn it back on it please.
See you soon.

Thank you all. I found the solution. I had created a shortcut used Ctrl + a to select the calculator and that stopped the select all to work. When I removed it Ctrl + a for the calculator selecting all reworked.

Tags: Thunderbird

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