Your tag line says that you have a 13" MacBook Pro running macOS 13.7 (Ventura).
If this is a
- MacBook Pro (13-inch, M1, 2020)
- MacBook Pro (13-inch, M2, 2022)
with a plain M1 or M2 chip, it supports only one external display. It can be a very high-resolution display (even a 32" 6K Apple Pro Display XDR), but there can only be one.
MacBook Pro (13-inch, M1, 2020) - Technical Specifications - Apple Support
MacBook Pro (13-inch, M2, 2022) - Technical Specifications - Apple Support
If this is a different MacBook Pro, please identify it and the specific Belkin dock (e.g., Belkin Thunderbolt 3 Dock Pro or Belkin Thunderbolt Dock 3 Plus) that you are using.