`Menu->Tools->Configuration Files->filetypes.common` delete all characters before `[styling]` in the symbols tab a Section `styling` should appear, delete all characters before `line_height=2;2;` and a `line_height` appears in symbols as a child of styling.
Save the file `<ctrl>+s` or use the menu, and the spacing changes.
Do not post videos of file contents, post the actual file in a gist and link to it (do not paste directly in the issue) that way it can be checked for invisible characters or other anomolies that are not visible on a video.
Also post the version of Geany and the OS you are using (post the lines near the top of `Menu->Help->debug messages`) on all queries issues etc.