deactivate() {

		if( !this.active ) return;

		const stateBeforeDeactivation = this.Reveal.getState();

		this.active = false;

		this.viewportElement.removeEventListener( 'scroll', this.onScroll );
		this.viewportElement.classList.remove( 'reveal-scroll' );

		this.removeProgressBar();

		this.Reveal.getSlidesElement().innerHTML = this.slideHTMLBeforeActivation;
		this.Reveal.sync();
		this.Reveal.setState( stateBeforeDeactivation );

		this.slideHTMLBeforeActivation = null;

	}
Deactivates the scroll view and restores the standard slide-based
presentation.