@WILDLAND-IA-DEV Alternatively, you can enable the IKRig plugin.
@catz111 Instead of deleting part of the .UPROJECT file, you might be able to just enable your IKRig plugin!
To test it, I disabled IKRig plugin on one of my 5.4.1 projects, and it removed the retarget option, so it’s possible that enabling this might fix your issue!