To precise Skeltoms answer:
all the Sideloader Modpacks are for the game and have to stay exactly in "mods" as your screenshot shows. This is important cuz on this place the update function (in InitSetting or KK-Manager) is looking for (game) mods to be updated.
Only the Sideloader Modpack-Studio is for StudioNEO - if only a few files included you can leave it there, but it´s correct you don´t need the big 150GB [Optional] Sideloader Modpack Studio to download for the game. As the name says it´s ONLY for StudioNEO.
One word to MyMods: here you store all extra zipmods besides the BetterRepack you download from anywhere for yourself. In this place they won´t be touched by the update function from Sideloader, otherwise they may be deleted when running Sideloader update.
This Sideloader update you should run after your install and testing correct game starting, cuz meanwhile some mods may have been updated against the versions in downloaded BetterRepack.
This updating you should run from time to time to always have the latest versions of (game) mods. But don´t forget to deselect the Studio Modpack section before starting the update.
View attachment 2605345
Also the Extra Maps are mostly for Studio and not usable for the game.