Hide objects

The "hide objects" feature is to avoid too much visual confusion if you work with many objects. You can make objects 25% visible or totally invisible to hide all uninteresting lines.
Please note: 
The selected object or group is always 100% visible.

Tips
The "Make all objects 25% visible" option is the most useful option if you work on complex constructions.
Use the "Make all objects totally invisible" when EOD is too slow and you want to edit a single object without seeing anything else. This could be useful for the custom object if you adjust single points.

Click on the eye-button to see a little drop down menu. The following options will appear

Here are some pictures to show you the differences:

100% visible	25% visible	totally invisible
100% visible (Ctrl+Y)
25% visible (Ctrl+H)