Hello,
1) 8theme – Filter Products by Price has Filter button http://prntscr.com/r63qro to apply the filter you need to click on the button, but on your site, this button is not visible because of dark version enabled http://prntscr.com/r63srg http://prntscr.com/r63rt6 , so I would recommend you to disable the Dark version in Theme Options > Styling.
Also, you can enable Ajax Product Filters (Theme Options > WooCommerce (Shop) > Shop > Shop page Layout http://prntscr.com/r63ttx ).
2) 8theme – Active Product Filters shows only applied filters so it is not visible from the start on the Shop page. As I can see it works correctly on your site – http://prntscr.com/r63usi
3) Filter Products by Rating – will be displayed once your products get different ratings. If you have products without rating and 5-stars products only, there are no parameters for sorting.
4) 8theme – Swatches filter –
You have 28 attributes http://prntscr.com/r640l6 and 27 are shown in the sidebar http://prntscr.com/r640ry Empty attributes, like this one http://prntscr.com/r640xr can’t be shown, so I do not see the problem. Here is pink – http://prntscr.com/r6418h and so on, please check one more time.
Circles are white because you did not select colors for them – http://prntscr.com/r63wlp Go to Attributes > Colours > http://prntscr.com/r63wtw Here are screenshots form our demo – http://prntscr.com/r63x0l > http://prntscr.com/r63x4r
5) You do not have Brands – http://prntscr.com/r63xy8 You need to add brands and associate products to them, then the filter will be shown on the frontend.
Regards