It is not possible. Project, Issuetype and Summary are 3 fields that is mandatory for all issues.
The best you can do is to rename Summary to something else using an add-on. Note that such a change will be impacted in all projects unless you write your own add-on that does this.
You can't. End of story.
The closest I can get if I'm allowed to code is to have a Summary that you fill with something by default on the create screen, and overwrite it with your own string in a post-function if you want (strongly recommended, as it's going to appear in lots of places no matter what you try to do to hide it)
Use the behaviours functions in the Script Runner add-on for default/hidden summary, and a scripted post-function to update it later.
No, that doesn't work, if you mean "you can blank it out". You still have to set it to something if you use a post-function, because: - It will still appear in lots of places - You'll have to fill it in if you want to edit or transition an issue - Lots of places (especially add-ons) break in interesting ways if it's empty
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