Hello,
2) That image is preloader image that you uploaded http://prntscr.com/pnxfoa You pressed the filter button and the loader appeared. You are using a nonstandard products page, so don’t enable the Ajax filter and Ajax pagination options http://prntscr.com/pnxnvc they won’t work without additional customization in your case. In addition, filter does not work ok even without Ajax. And not just our theme filter widget but the default WooCommerce Filter by attribute widget, you can add and check. Filters work only with Archive products element http://prntscr.com/pny8uz
Also, take into account that you don’t have pagination to show all the products from the category, for example, https://lianamore.com/product-category/dessous/ There is pagination by default http://prntscr.com/pnxub6 but not if you use the WC Product category element of that plugin http://prntscr.com/pnxwl4 So, how your customers will check the other products? I think you need to use another element to show all the products of the category http://prntscr.com/pny0n2 and update styles for the sorting and pagination because they are missing while using this element. Anyway, clarify all of this with the plugin author.
The custom that you add using Yellow pencil plugin hides category page elements https://gyazo.com/c39b0fd92beeb9d262193643a7786498 I would recommend you to hire a professional developer who is familiar with CSS and won’t use negative margin to remove the top space between sections. if you need to change a lot of things according to your design, for example, send customization request to WPKraken team.
Regards