show() {
      if (!this._dialog) {
        this._sortOrder = this._sortOrderListDomRef;
        this._sortBy = this._sortByList;
        // Sorting
        this._initialSettings = this._settings;
        this._currentSettings = this._settings;
        this._confirmedSettings = this._settings;
        this._dialog = this._dialogDomRef;
      } else {
        this._restoreSettings(this._confirmedSettings);
      }
      this.fireEvent("before-open", {}, true, false);
      this._dialog.show(true);
      this._dialog.querySelector("[ui5-list]")?.focusFirstItem();
    }
Shows the dialog.
@public
@method
@name sap.ui.webc.fiori.ViewSettingsDialog#show