In order to use the Button Choose widget, create a new page from wp-admin>pages:

Now edit the page with Elementor:

Type EazyFilter in the search box and drag the Button Choose widget. Here we already have the product widget that we created from before:

Now we have to select a filter to render:

Now you can either create a new filter by clicking the highlighted button or use an existing filter. For this tutorial we will use an existing Button Choose filter:

After selecting the grid and choosing appropriate filter you now have the filter ready for use:

On the left side, you have control over Query ID, Apply Type, Apply on, Show filter Name & Flow Direction:

When you press publish you are ready to use your freshly minted filter: