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.
We have planned this as part of our bigger initiative to re-write the Jira Issue, however we still don't have firm dates as the current bandwidth and priorities wouldn't allow us to tackle this work. Saying that, since this is getting more attention from the community, we are going to do an investigation on the possibility of a workaround.
Aidin- Product Manager