How do I increase the number of options displayed for each filter?

Go to Products > Product Filtering.

Find the filter you want to edit. If you want to edit a filter that is specific to a certain category, first use the dropdown that says “Storefront (all categories)” at the top of the filtering screen to select the category you want to edit.

To the right of the filter, click the ellipses (three grey dots) and click Edit Settings. In the Show dropdown, select the number of options you want to display. Note that the maximum number of options you can display is 15.

Make sure to save your changes when finished.