How can I format a cell so that the text will spread into the empty adjacent cell like it does in Excel?

How can I format a cell so that the text will spread into the empty adjacent cell like it does in Excel?

How can I format a cell so that the text will spread into the empty adjacent cell like it does in Excel? "wrapping" is not the effect I'm looking for because it expands the size of the cell vertically. Thanks for any help.