Go to the Filters tab and the plus button.
Enter the filters title, e.g. Size. Next, choose the Tags attribute, which will be used for filtering.
Next, you need to add tags for your filter. Click the plus button.
Add tags associated with the sizes.
Filter options are shown in the storefront in the same order they were added to the Searchanise admin panel.
Please don’t forget to click the ADD VALUES button after you choose the values on the page.
All tags can be edited after you add them.
Next, go to the Filters main tab, click Edit Filters, and find a filter called Size. Change the Appearance type of the filter to the Size value.
Now you have the size filter on the search results page.