You can set the map to color the solar system points according to their security level.
The security level varies from +1.0 to -1.0.
The map of the Eve-Online client displays all systems with a negative security level as 0.0, but their true security level is a useful information to have. Getting closer t0 -1.0 means that the system has npcs with higher bounties and have rarer ores in its asteroid belts.
The display properties panel allows you to change the point size of solar systems, and to color the solar systems according to some attributes.
The legend and region name overlay can get in the way and they come at an important performance cost. You can toggle them on and off from this panel as well.