I am using Workbench version 6.3.5 Community and this is GUI question only.

When creating a new table auto increment check-box is disabled.  

Is it a bug or I need to enable this some how in options?  

And how to set start value and step for auto increment in GUI when creating a table?

[![workbench](https://i.stack.imgur.com/jIPOX.png)](https://i.stack.imgur.com/jIPOX.png)