Diagnosis
The monitor is likely using a default picture mode (like "Reader") that prioritizes low blue light over color vibrancy, or your graphics driver is outputting a limited color range.
How to Fix It
Press the joystick on the back of the monitor to open the OSD menu. Navigate to Picture > Picture Mode. Change it from "Reader" or "sRGB" to "Custom". Then, go into Picture Adjust and you can tweak Brightness, Contrast, and Sharpness to your liking. For a quick fix, the "Vivid" mode will pop the colors a lot more, but it can look oversaturated.
If That Didn't Work
The issue might be on your computer's end. On Windows, right-click the desktop, go to Display settings > Advanced display > Display adapter properties for Display 1. In the new window, go to the Color Management tab and make sure sRGB is the profile. Also, in your graphics card control panel (NVIDIA/AMD/Intel), look for a setting like "Dynamic Range" and set it to "Full" instead of "Limited."
Heads Up
This is an IPS panel, so viewing angles are great, but its color gamut is standard sRGB. It won't match the punchiness of some high-gamut laptop screens, so temper your expectations after calibration.