Hello,
Please check if you have set up the brands as per this manual: https://xtemos.com/docs/woodmart/faq-guides/how-to-setup-brands/
You need to add images and make other configurations as per your needs,
Then using the search find the WOODMART WooCommerce Layered Nav
Alternatively, install the plugin “Classic editor” It would convert the Widgets and sidebar to the view it has always been. As soon as you configure the sidebar, you can delete the plugin.
Best Regards