for most input text areas that a block has entering long JS or something will word-wrap to the next line and enlarge the text area line below (taken from inserting a DB record using key/value pairs)
or this one from adding json key/values to the body of a rest request
in a few situations however this box stays the size for single line entry
and if you click the down arrow once I see
but the only way to see anything beween the 1st and last line you have click into the text area and arrow up/down