The easiest way to do this is by navigating to Manager, then clicking on Apps. Next to the App you're interested in, click the Permissions link. At the bottom of the page, you'll see a set of radio buttons with this text:
Sharing for config file-only objects Set permissions for configurations that have been copied over or added to config files rather than created through the UI. Objects defined in config files only (not in the UI) should appear in
Set this to All apps, and everything you create within this app will be shared.
If you want to share a specific object (saved searches, event types, fields, etc), you can navigate to that object within Manager, for example Manager -> Saved Searches -> Permissions for specific saved search. You will see a similar set of radio buttons. Choose All apps to share your saved search.
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