If you want to set the position of horizontal scroll position inside TextField, you can use TextField.scrollH.
Let’s say I am typing in the input TextField and I typed beyond the width of TextField. You will see the last characters visible you typed. Now due to some other event, say user clicks on other than this TextField, focus is changed to some other object than this TextField, you may want to reset the scroll position of TextField to starting characters in it.
You will use :
TextField.scrollH = 0;
This will set the horizontal scroll of TextField to 0 and hence showing the starting characters in TextField.