When trying to add multiple lines in the cell edit dialog box, while the bar at the top (fx bar?) has up and down arrows to scroll between lines. This can be a little cumbersome. Please allow for vertical expansion of the edit bar.

Web based spreadsheets Excel and Google Sheets support this. As well as client install Excel and Libre calc all allow this. I would say this is fair justification of the utility of this feature and a request for feature parity.