Turning Number Recognition On or Off in Tables
From LibreOffice Help
LibreOffice can automatically format dates that you have entered into a table, according to the regional settings specified in your operating system.
Do one of the following:
- Right-click in a table cell and choose Number recognition. When this feature is on, a check mark is displayed in front of the Number recognition command.
- Choose Tools - Options - LibreOffice Writer - Table, and select or clear the Number recognition check box.
Tools - Options - LibreOffice Writer - Table