• In Solution Explorer (CTRL + ALT + L in BIDS 2008), it is the name on top (usually in BOLD), it contains other folders such as Data Sources, Data Source Views, SSIS Packages (and other folders created by user).

    Right Click on that Folder Name>> Click on Properties>> (in the dailog box) click on Debugging located in the panel on left hand side, you will see Run64BitRuntime (in Debug Options group).