Hello @eweiler,
The case here is in the Plain text height. You can adjust the height of the input to the content using this code:
fd.spRendered(function() {
//Replace FieldName with the internal name of the field
var textArea = fd.field('FieldName ').$refs.textarea;
function recalcHeight() {
textArea.style.height = (textArea.scrollHeight > textArea.clientHeight) ? (textArea.scrollHeight) + "px" : "120px";
}
recalcHeight();
$(textArea).keyup(recalcHeight);
});
Note, that this code works for Plain Text fields only.