Changing Trace Width
       
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  Changing trace width manually
From project explorer→ double click on PCB Layout to open layout editor 
Set 
 
Grid = 0.1000"
 Snap = 0.0500"
 
 
Select LINE\TRACE THICKNESS
 Change the trace thickness according to the required level.
Changing trace width automatically
Select Auto →Auto Router → Arizona
File →Load board to route from project 
Select from Function toolbar Parameters Setup →Click on Routing Parameter Settings
 
Click on Width&Via and select the width thickness and accept.
Now select Auto routing Routines from function tool bar → select Start Auto 
router
After completing select miter from option toolbar
Close the window → select Update Project and exit
 Placing components 
Useful Tips while placing components 
 - Always place the components in grid. 
- Always place components in the direction of current flow.
- Place the IC having maximum number of connections in the centre of the board.
- Place the connectors, transformers etc near to the edge of the board.