Frequently asked questions - Calc
From The Document Foundation Wiki
I want to write abc in a cell and LibO prevents me from doing so
There are two possible cases:
- LibreOffice systematically capitalises the letter at the beginning of the word: you need to deactivate this autocorrection see here;
- You have already written Abc in another cell. You now need to deactivate the Autoinput function. Go to ▸ and uncheck it.