What is the Eye for?
When you reach level 10 and you pick up a tool to work the items on your farms like the harvest tool for harvesting crops for example, if you look in the bottom right corner of the game screen you will see an
Eye. This gives you the option to hide non-relevant items for the tool you are using.
Click on the Eye to change the setting.
When the Eye is BLACK you still see everything on your farms.
When the eye is RED, you will only see the items the harvest tool can harvest, like fields, trees and flowers. Clicking on an item with the harvest tool will harvest the item then make it temporarily disappear from view, which can be easier for you when you have more items on the farm.
When you stop using the tool or click on the green man to stop using it, the items will be visible again.
As you progress through the game, use other tools and get more tools you will find the Eye will also show up when using some of those.
Much larger tools like the 20x20 tools will not have an Eye, instead you will see a picture of the tool you picked up to use. You can also click on that tool picture and you will see you have Highlight Mode and also an Extent mode to use.
Clicking on the top icon uses Highlight Mode.
Clicking on the lower icon uses Extent Mode
Clicking on the white X closes the Mode box.

If you bought a 20x20 combine and would like to see an example of the Extent mode which uses a Blue box CLICK HERE
If you bought an EX Combine which can work on overlapped crops and would like to see an example of the Extent mode which uses a Yellow box CLICK HERE

When using Full Screen mode:
The Full Screen icon ,indicated in the picture with an arrow, allows you to view the farm much bigger so that it fills the whole screen on your computer.
Click on the icon to go Full Screen, click on it again to return to normal screen.