The buttons you are seeing there are associated with Transitions not statuses.
prerequisite - You need to be an admin
Edit the workflow in diagram mode - project settings > workflows
double-click the transition called "In Progress" and change the name there.
WARNING: if this workflow is shared you will change it for all projects that use the workflow. if that is undesirable then copy the workflow, edit it and then associate to your specific project under that same Workflow screen mentioned above.
Hello, Atlassian Community! I thought it would be fun to do something different for my teams' last retrospective of 2019 so I'm planning to do a "year in review" with info-graphics. Wha...
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