Timeline has a condensed prop that will reduce the vertical padding and remove the background from the badge item. These are most commonly used in commits. To condense a single item, remove the top or bottom padding with the pt={0} or pb={0} prop.
<Timeline>
<Timeline.Itemcondensed>
<Timeline.Badge>
<Octiconicon={GitCommitIcon}/>
</Timeline.Badge>
<Timeline.Body>This is the message of a condensed TimelineItem</Timeline.Body>
</Timeline.Item>
<Timeline.Itemcondensed>
<Timeline.Badge>
<Octiconicon={GitCommitIcon}/>
</Timeline.Badge>
<Timeline.Body>This is the message of a condensed TimelineItem</Timeline.Body>
To create a visual break in the timeline, use Timeline.Break. This adds a horizontal bar across the timeline to show that something has disrupted it. Usually this happens when a close or merged event occurs.
<Timeline>
<Timeline.Item>
<Timeline.Badgesx={{bg:'danger.emphasis'}}>
<Octiconicon={FlameIcon}color="fg.onEmphasis"/>
</Timeline.Badge>
<Timeline.Body>Background used when closed events occur</Timeline.Body>