Hello i am really enjoying your mod in the modpack i play. I used the smaller portal of slimes in a big room and all went well. Howerver after being ready for the big gateway and preparing a really cool fighting room, it told me not enough space.

i second this, same story here, build a separate building to do the gateways in an enclosed space, documentation on how much space is needed for the different gateways really is necessary

Default values have been noted on the curseforge page, and any deviations will be noted on individual pearls as of 4.2.0