Sry - have no clue what you´re talking about
If you´re meaning after extraction to your game main folder (should be lacated on top od a drive) - yes, there are now many folders and files inside, what did you expect?
And NO - you can´t save space, Illusion games and especially all the mods don´t use any compressed game files like most AAA games.
With 1 exeption: for the case you´ve also downloaded the "Optional Sideloader Modpack Studio" (|190GB packed) - this is ONLY for StudioNEO and you only need it if you intend to intensively work with StudioNEO (creating scenes and animations).
Btw. now I guess it´s necessary to remind you that´s a usual behaviour here to give "Likes" to those who are helping you, okay?