Making multi-line text box full size without stretching the box

Making multi-line text box full size without stretching the box

In activities there is a description field.

That field is multi line - free form.  In view mode the filed is fully opened to accommodate all the text in the box.

On edit the box shrinks to just a few lines.  Can we change that so on edit it also shows all content without the user having to drag it open?

Thanks