Excel cells will hold your text as you enter them, however, if the text is long, it can run into other cells. You will need to make the Excel cells fit the text.

How to Add Longer Text Into Excel Spreadsheets. When you enter longer text than will fit in a normal Excel cell, the excess text either carries over into the next blank cell or is truncated by ...

When text is too long to display in a label cell, you can use Microsoft Excel’s AutoFit feature to enlarge the cell enough to fit the contents.