Arduino Text Scrolling on 16x02 I2c on NodeMcu (ESP8266-12)
Inspecting the library code, it is apparent that the method called only sets up a command bit field and it is actually the display that performs the operation.

So, you might check if your LCD is capable of performing the scrolling operation.

This web page contains a tutorial on how to use the scrolling feature.  In this code example from that page:

void loop() {
  // scroll 13 positions (string length) to the left
  // to move it offscreen left:
  for (int positionCounter = 0; positionCounter &lt; 13; positionCounter++) {
    // scroll one position left:
    lcd.scrollDisplayLeft();
    // wait a bit:
    delay(150);
  }


...you can see that it is not automatic.  That you need to call the method each time you want to scroll (in this case) one position to the left.