Hello there,
The point is:
When editing slides, text position on mobile layout/version in elementor, there is no corresponding visual result at the mobile browser. Modifications made have no effect on mobile view.

In the other hand, when editing slides, text position on desktop layout/version in elementor, there is corresponding visual result at the desktop browser. However, the editions made at desktop layout in elementor are also reflected on mobile browser. It was not supposed to happen.