See how it works:
1. You open the filter, select the value "125 mm" there and check the box "Show products without the specified filter value"
2. You are shown products that do not have the value "125 mm" in the selected filter.
If you just filter with the "Show products without specified filter value" button, nothing new will happen. Those. The checkbox itself does nothing unless you select a value.
https://rovo.org.ua/admin/shop/products/?45249filterproductvalue83=125+%D0%BC%D0... &filterid=&filtername=&filterarticul=&filtermodel=&filterbarcode=&filterpricefrom=&filterpriceto=&filtertags=&filterbrands=&supplierid=&filtergroupped=&filterviewsfrom=&filterviewsto=&filtersourceid=&filtercustomstatyazatrat5=&filteremptyfieldid=&filtersuppldatefrom=&filtersuppldateto=&filtershare=&filtercustom3=&filtertax=&filtercdatefrom=&filtercdateto=&filterauthorid=&filter_nofilter= &filtercustomobnovlyattsinipriimportijson6=&categoryid=7321&searchLine=
here with the filter 125mm+"Show products without the specified filter value" - 688 items
вот без
https://rovo.org.ua/admin/shop/products/?1219629filterproductvaluenotin83=1&... =&filterpricefrom=&filterpriceto=&filtertags=&filterbrands=&supplierid=&filtergroupped=&filterviewsfrom=&filterviewsto=&filtersourceid=&filtercustomstatyazatrat5=&filteremptyfieldid=&filtersuppldatefrom=&filtersuppldateto=&filtershare=&filtercustom3=&filtertax=&filtercdatefrom=&filtercdateto=&filterauthorid=&filter_nofilter=&filtercustomobnovlyattsinipriimportijson6=&categoryid=7321&searchLine=
765 products.
Those. 765-688=77 products have a value of 125mm for the Disc diameter filter.
If you need a different logic for this filter - please describe it, I can evaluate the improvement.