Can the Trigger be changed?

Can the Trigger be changed?

I'm afraid I already know the answer, but here goes...

After activating a workflow (under Campaigns > Automations), Then later choosing to Edit the workflow, Can the Workflow's Trigger be changed?

Currently the entire Trigger section + options are gone when you edit an active or frozen workflow. The Only alternative I've found is to clone the workflow and reset the trigger. Obviously this is a messy solution. Am I missing something obvious here?

Thanks.