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Javadoc completion could be made more compact and lighweight. I mean mainly using plain fonts, smaller fontsize, less useless white around it, covering less space of editor. See screenshot attached to issue 37313, which shows that the less important information in editor catch major attention of user.
Changing subcomponent to "code completion"
Problem with large fonts has been already solved - issue #37313 As for wrong rendering and a lot of empty space - issue #51327 If there are any other enhancements, please reopen the issue