Despite its having been huge in content, OSM menu is easy to use.
The number of clicks to reach a desired menu item is minimal.
The menu is well structured and divided in two submenus.
The first one (Red Frame) comprises selection of the most frequently used functions.
The second one (Green Frame) - Advanced menu - provides access to the whole OSM.

The initial OSM page of an average monitor usually means Brightness and Contrast controls.
The 2490 menu opens with five "first aid" tools.
Eco mode allows to drop brightness to 75%, 50% with one click.
Auto Brightness - this is where 2490 begins.
Auto Brightness has two modes.
1. Brightness is automatically adjusted according to ambient light.
2. Dynamic Brightness.
Do not confuse this with so-called dynamic contrast - a marketing gimmick for cheap monitors.
2490 Dynamic Brightnes is a really working feature.
It regulates brightness according to the screen content.
Black level - makes darker parts of the image look darker. Technically it does not reduce brightness of black.
Black level control can be helpful for manual adjustments in some cases - video with no ambient light is an example.