If you have a lot of custom fields, it can take a while to scroll through them to find the ones you want to show on a particular smart list.
Add a fuzzy search box to this column list now with a single click in the GHL Customizer.
Click the GHL Customizer's "Features" button.
Open "Contact Smart List Upgrades" from the side menu and check the box for the "Add a search filter to the column selector in smart lists" option.