The JIRA details shown in current JIRA Issue component only takes up 1/3 of the section in which it is placed.
There is a css tag being placed on the component 'slds-medium-size--1-of-3' that is causing this.
If this tag was removed, or if we could add our own tags, or be given access to customize the component, the display issue would be fixed.
I've attached screenshots of what it currently looks like, as well as what it would look like if that css tag were to be removed.
This is going to be shipped with the first iteration of our Salesforce Package rewrite this fall.
Aidin- Product Manager