It's space - when you've got priority across the top of a column, it chews up space in the column, leaving all the issues with a wide block of white.
Some server users change the column name in the code (it's in a template, so not a massive change job), and also widen the display of the priorities themselves.
Hello Community! We’re excited to announce that Mindville Insight’s asset and configuration management capabilities will now be integrated into Jira Service Management Premium and Enterprise plan...
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