This will work only with the text edit cursor inside the cell, not at the input line. So first double-click the cell, then single-click at the text position where you want the line break.
该功能仅在文本编辑光标在单元格内时有效，如果光标在输入行则无效。所以请先双击单元格，然后单击要换行的文本位置。