Make sure the permissions of the relevant saved searches are set so that they're globally viewable, not only in their respective apps. You can set this in the saved searches section in the manager. Once they're globally accessible you can put them all in the same common app. One gotcha that you could encounter is that saved searches could be referring to other knowledge objects (macros, tag, eventtypes...) that are only viewable in their own app. If that's the case, do the same thing with setting permissions on these knowledge objects as well.
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