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hmmmm the admin area is being worked on for the new version.. until then there aint much you can do other than manually edit the code for it..
however, you could try the admin revisited module available from the dev.xoops.org site, as that has a few options available, such as view all blocks, view active blocks, view inactive blocks etc.. it might not be exactly what ur after but it's a big improvement over the current system..