Hi @Ersen Geyik
To remove the default assignee you'll need to be your Project's Admin and then:
True @Joe Pitt!
I'm quite sure this is ON by default - but for completeness, it is something worth checking if this doesn't work for you - to check this in your org:
^ If you want to turn it OFF, you'll need to ensure all issues are assigned first, and no projects have the "Default Assignee" set to Unassigned either.
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