Long text gives participants a text box of several lines for open answers: feedback, suggestions, descriptions. The box shows participants that you expect more than a few words. For one line, use Short text.
Click the purple + in the top bar. The question type picker opens.
Under Text, click Long text. The question appears at the end of the current question group.
Click Your question here and type your question.
Select the question to open its settings on the right.
The answer is the text as typed, including line breaks. In the export it is one column per question.
Huge free text is not a question type in LimeSurvey 7 any more. Use Long text and set Display rows to the height you want.
Add a rule under Advanced > Logic: strlen(Q020) > 100 in Question validation equation accepts answers of more than 100 characters, for a question with the code Q020. Type a message such as "Please write at least a few sentences" into Question validation tip.