There are 68 collapsible widget positions. If no widget is published to a position, it will not appear, collapsing the entire area.
The below diagram is of the Widget Variations page.
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Widget Positions
Add Icon 
Arrow Icon 
Briefcase Icon 
Calendar Icon 
Check Icon 
Crank Icon 
Delete Icon 
Docs Icon 
Email Icon 
Home Icon 
Key Icon 
Lock Icon 
Minus Icon 
Monitor Icon 
Notes Icon 
Post Icon 
Printer Icon 
RSS Icon 
Unlock Icon 
Warning Icon 
Write Icon 
Preset 1 
Preset 2 
Preset 3 
Preset 4 
Preset 5 
Preset 6 
Preset 7 
Preset 8 
Preset 9 
Preset 10 
Preset 11 
Preset 12