At moment, you can modify the space between lines into the config.yml of HolographicDisplays dependency.
Version: 1.0.4.4
Not that good plugin as it lags the server like crazy.
Players cant even join a server with 8 gb ram,2 core 4 threads,ssd localhost dedicated
only plugin i have except this is holographic display extension and bedwars1058+ajleaderboards
Great plugin! Such a shame the developer don't have a discord or a github to post bugs, it's pretty hard to send him bugs if isn't for PM, still the best holograms plugin out there.