𝐉𝐮𝐬𝐭 𝐰𝐫𝐚𝐩 𝐲𝐨𝐮𝐫 𝐥𝐞𝐠𝐬 '𝐫𝐨𝐮𝐧𝐝 𝐭𝐡𝐞𝐬𝐞 𝐯𝐞𝐥𝐯𝐞𝐭 𝐫𝐢𝐦𝐬
Typing text into spreadsheet cells can be frustrating. The default for text you type is to continue on forever, without wrapping down to a new line.
You can change that.
Click Wrap Text on the Home tab at the top of the screen. This will wrap the text of the cell you're in. You can then resize the row/column and the text re-wraps to fit.
If you've got multiple cells that have text overruns, select them all before you click Wrap Text. Or, select all the cells before you even type in them and click Wrap Text. Then whatever you type will wrap in the future.
In Google Sheets
Click on Format > Text Wrapping > Wrap