We are on Magento 2 CE when we search for any keyword Filter at search result page is not working. you can can at on https://www.mygetwellstore.com where as working on new installation at local machine.
You need to go to backend,
Stores -> Product
click on your attribute you want to show as search page filter,
Now set searchable attribute to Yes and save product.
We wants price as to be filter attribute it is appear on list but does not work.
Even Pagination and Mode view (Grid & List) , Show ___ Per Page etc. on Search Result Page where as working on category page
for your reference please check oxygen cylinder category with large number or products. https://www.mygetwellstore.com/oxygen-therapy.html?product_list_limit=30&product_list_order=price