How can i edit the code behind a appian project. Is it possible to get the project opened in a IDE and customize it as we wish

I just was creating a sample appian project which adds task to different roles. I found that the appian adds a accept or reassign slider on the header by default. 

What must I do to remove it or change any similar things which are part of the appian framework.

I found that they are basically java based applications. So is it possible that I can edit the project in a IDE like eclipse.

Any guidance as to where to look at to customize everything about a appian project is much appreciated.

Thanks

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