Slide effects and horizontal scrolling

Hi,

When ‘slide’ is applied with no effect options ( $w( “#boxAnalysisExtended” ).hide( “slide”); ) all is good. ( first animation below)

But when it is applied with effect options,

let slideOptionsRightMove = {
 "direction":    "right"
    };

I have the horizontal scrolling bar appearing when the animation ends (second animation below, at the end of the video). Why?

https://www.screencast.com/t/XPft7cbX4ej