Double-click the cell
Place the cursor where you want the line break
Press Alt + Enter on Windows
Press Control + Option + Return on Mac
Turn on Wrap Text if needed
Click outside the cell to save the line break
Double-click the cell
Place the cursor where you want the line break
Press Alt + Enter on Windows
Press Control + Option + Return on Mac
Turn on Wrap Text if needed
Click outside the cell to save the line break