Hello,
1. It is not possible to remove sub-categories only from brands.
2. You have created a brand as a category. Here is the manual how to set up categories correctly so that they could be filtered https://xtemos.com/docs/woodmart/faq-guides/how-to-setup-brands/
3. Do you mean Sidebar – Also, tried to add the Mobile bottom navbar and doesn’t work. Anything I can do to make it work?
4. You can rewrite all theme and plugin texts via PO file in WordPress. Here is a video tutorial that should help you rewriteyour website texts with a Loco Translate plugin https://www.youtube.com/watch?v=D3NsDdMzsls&list=PLMw6W4rAaOgKKv0oexGHzpWBg1imvrval&index=3
5. Just trying to have user able to search by brand – Woocommerce search find the product by a keyword only.
As for the Wishlist:
a. Create a page and insert the shortcode [yith_wcwl_wishlist]
b. Navigate to Wishlist plugin and set the page: http://prntscr.com/ls1ewo
Best Regards