Created attachment 98533 [details]
position tab page ugly borders
Open Writer > Bullets and Numbering > Position or Option tab page. The preview field (SvxNumberingPreview) looks ugly due to some doubled border.
As comparison open Writer > Tools > Outline Numbering, which has a nice border. Take this as reference.
Thomas Arnhold committed a patch related to this issue.
It has been pushed to "master":
fdo#78321 Bullets and Numbering: SvxNumberingPreview looks ugly
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.