Type to filter long lists in every modal.
Any bill dropdown (in Pay, Split, Add Funds modals) opens a search box on click. Type 2-3 letters, hit Enter to select the highlighted match.
Arrow keys move the highlight, Enter selects, Escape closes, Tab leaves without selecting. The picker auto-focuses the search field on open.
Bill name and the small sub-line (usually the expected amount). Vendors and categories are searched in their own dedicated pickers on the Vendors page.