Hello,
Shop sidebar content you can change via Appearance > Widgets. You have only 1 product, so there is no for what applies filters. Add more products, watch this video – https://youtu.be/LgzC4iK-j6A Here are screenshots from the demo – https://prnt.sc/uce6k7 https://prnt.sc/uce6mu https://prnt.sc/uce6pu
Also, your pages use WPBakery Page Builder editor, so the Elemenemtor plugin can be disabled.
Let us know if you need any further assistance.
Regards