Thank you for your response, the one you're showing is Multi Value Text
which is different, that allows the user to add string[], one string at
a time. Multi Line Text is basically a textarea, single text but it's
for long text to make it more usable. Screenshot below is from normal UI
(non touch UI)
http://localhost:4502/damadmin#/content/dam/textsize/2015-Cadillac-ATScoupe-070.jpg