On the top of the filters panel, you have the option to sync or unsync the filters with the toggle button.
By default, filters will be unsynced. This means that you can select various filters before the search page refreshes to display your results.
When working with unsynced filters, you have to make sure to click on the blue "Search" button once all your filters are selected to launch the page refresh and your new sets of results.
On the contrary, when working with synced filters, your search page will refresh every time you select a new filter.