Single drawing compatibility mode 1

[victroladoctor]

I must have switched a toggle in 2008 and can only have one drawing open at a time. In 2002 this was just a check box under options / systems / general options. Where do I find this in 2008?

Thanks

 

[lpseifert]

SDI=0

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Civil 3D 2008, Terramodel

 

[victroladoctor]

Thank you very much.