Hi @Miron Aloni
Currently, it is not possible to filter Tests not linked to Test Set, due to the Cloud Architecture, which doesn't allow us access to the Jira Database, stopping us from creating a JQL function to give us that information.
As an alternative, we suggest using the Test Repository to organize the Test, which gives much more flexibility and easily finds which Test cases are not yet organized.
If you need further help, please contact the Xray Support (http://xraysupport.xpand-it.com) so that we can request additional information and investigate further.
Rogério Paiva [Xray Support Team]
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