Is there any way to disable default Appian task reassign feature when you click on task with process task link?
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That's controlled in the Task Assignment configuration, under "set reassignment privileges". I should also point out that even if a task is set to have "none" for reassignment privileges, if you open the task using a user account that's set up as an Administrator, you'll still see the reassignment buttons - but a basic user wouldn't.
Thanks Mike for the answer, but I had already set "none" for the reassignment privileges, still it is showing the reassign button. The user type is basic too. Let me check again if anything is missed.
A few additional things to check:
Adding: That user must not be in the process manager role.