You can find this page in the Shop settings menu. Filters are very useful for customers because it allows them to find what they are looking for faster and easier. When you create a filter group in it you will see every attribute and property you’ve added plus filters for subcategories, brand, and price. You decide what filter to activate for this group and for which categories to be active. Then ‘Save’ the filter. You can turn on and off the filter group at any time. 
Note that when you create a filter group you need to refresh your filters so they can be visible in your shop.
You can use also the button on the header of your admin.