Agree, all added filter are only using AND. Be nice to setup more complex queries like you've pointed out.
Looks like Wrike does in fact support multiple folder search, space delimitated. `folder:Bug folder:"Mobile Platform"` and then clicking `Search within current folder` will give you the results you...
Moreover if folders have spaces in it, you can't search those folders. The work around is to duplicate folders, which leads to confusion and various problems.
Agree, being able to apply multiple folder search is very much needed. Ideally being able to create advanced searches similar to something like JIRA which does a great job of it.
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