Unfortunately, the mass update functionality via the UI (since the version 10 release) is a bit limited.
As a workaround I would suggest the following process:
1) Filter the Feature grid page to the results you want (i.e. Filter by owner)
3) update the owner - be sure to use the name EXACTLY as it is listed in Jira Align
4) Import those features back into Jira Align.
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