Yes, you can modify a Disney dining reservation to a smaller party size, and in 2026, this is easily done through the My Disney Experience (Disney World) or Disneyland mobile apps. Under the "Future Plans" section, you can select your reservation and hit "Modify." Reducing the party size (e.g., from 4 to 2) is usually successful as long as there is still a table that accommodates your new size, though the app may occasionally show "no availability" if the restaurant is strictly optimized for larger tables at that time. A "pro-tip" used by many Disney fans is that if the app won't let you modify, you can simply show up at the restaurant and tell the host that your party is smaller. Disney typically does not charge a penalty for fewer people arriving, as long as at least one person from the reservation shows up. However, you should never do the opposite (bring more people) without a confirmed modification, as Disney restaurants are often at strict fire-code capacity and may turn the extra guests away.