Your players are only seeing a small part of the beautiful map you've created for them! What is this heresy? 

The ability for the players to properly enjoy the hours of your hard work is being throttled by some little round circle that follows their token everywhere. If you find this to be unacceptable and are not currently using Dynamic Lighting in your map, the answer may be as simple as switching a setting! 

When signed in as the GM of your current game, go to the "Weather and Special FX" tab (or press [W]), then find the Dynamic Lighting section. Click the "No Dynamic Lighting" option.

This will show the entirety of the map to your players and will improve the performance on some computers. This can be especially useful in large maps, such as cities or regional maps where the player's view doesn't need to be restricted. 

Related articles and Resources: 

Dynamic Lighting (Tips and Tricks)