There is a not a way to natively resize that panel in Jira at the moment. There is a feature request to add this ability in JSWSERVER-9236.
I hope this helps.
Only three years old. I'm sure this will be fixed any day now!
No, wait, the new layout IS WORSE!
Code snippets in the issue can't be read because the issue display column only shows the center 1/3 of the screen, most of the rest being whitespace. On a 27" screen.
It's like you don't even use this product yourself.
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