First of all, you need to configure the sidebar on the shop page. Navigate to the Theme setting > Shop > Shop page layout and set 2 columns left or 2 columns right. Then go to Appearance > Widgets and add Attribute filter widgets to the Shop page widget area, use Basel Woocommercd Layered Navigation widgets.
Please check this category the sidebar works here beta/product-category/women/
As for the link you provide, you should set the sidebar inside the page and choose the custom sidebar. Please note: the Woocommerce filters would not work on a custom page https://xtemos.com/docs/basel/options-for-pages-2/