Currently, you are only able to delete stages if candidates haven't been in that stage or if you haven't rejected any candidates from that stage before. 

If a stage is eligible for removal, you can select the three dot menu on that stage and the last option will be to "Delete stage":

If you aren't able to delete the stage that you were hoping to, you can replace the stage with another Talent Trial or move the stage all the way to the right at the end of your funnel (so it is out of sight and doesn't interfere). 

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