Vero, I think that post is about Trello but the question is about Jira I think?
if you are indeed speaking about Jira and you want to remove someone from the project:
welcome to the Atlassian Community.
In case you refer to "People" where you can form a team within Jira Cloud you can remove team members by clicking on "..." next to their respective name.
In case you meant something else - could you please kindly provide a screenshot and/or describe what you are seeing?
Thanks in advance!
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