You've to move the bottom cursor of the ruler to the left to create a negative indent.
You can see the consequence in the paragraph properties (right click then Paragraph) : go to the Indents & Spacing tab. The Before text field will be negative, make sure the First line field is equal but opposite.
Better create a paragraph style for such layouts in case you want to modify the settings afterwards.
Thanks to add '[Solved]' in your first post title (edit button) if your issue has been fixed.
NB: .png is a better format for screenshots.
LibreOffice 25.2 on Linux Mint Debian Edition (LMDE 7 Gigi) and 25.2 portable on Windows 11.