async showAt(opener, preventInitialFocus = false) {
      if (!(0, _Device.isPhone)()) {
        await super.showAt(opener, preventInitialFocus);
      } else {
        this.style.display = "contents";
        const nextZIndex = (0, _PopupUtils.getNextZIndex)();
        if (!nextZIndex) {
          return;
        }
        this.style.zIndex = nextZIndex.toString();
        await this._dialog.show(preventInitialFocus);
      }
    }
Shows popover on desktop and dialog on mobile.
@param {HTMLElement} opener the element that the popover is shown at
@param {boolean} [preventInitialFocus=false] Prevents applying the focus inside the popup
@public
@async
@method
@name sap.ui.webc.main.ResponsivePopover#showAt
@returns {Promise} Resolves when the responsive popover is open