In the configuration screen of the Performance Objectives, Performance Trend, Multi Metric Combined Chart, Multi Metric Trend Chart, Heat Map, Change History, Scatter, and Bubble Chart gadgets, you will find a "Label Rotation" option under the "More Settings" section. This option allows you to select your preferred alignment for the label name, which corresponds to the "Display By" Jira field on your chart.
This feature is particularly useful when dealing with a "Display By" field that has a lengthy name, ensuring complete visibility in your report for fields such as Assignee, Issue Summary, and more.
https://www.youtube.com/watch?v=Vg-h1r5ZzI0&list=PLm4bOt5Rgclg_UAQQsg1Q-ylKfb_INSO7&index=3