Adjust line spacing 
Controls the spacing between successive lines of text. This setting is interactive: it appears at the same time in image text. The number is not the space between lines itself, but how many pixels must be added to or subtracted from this space (the value can be negative).
https://docs.gimp.org/2.10/en/gimp-tool-text.html
Controls the spacing between successive lines of text. This setting is interactive: it appears at the same time in image text. The number is not the space between lines itself, but how many pixels must be added to or subtracted from this space (the value can be negative).
https://docs.gimp.org/2.10/en/gimp-tool-text.html