Config Interfaces
You can usually find all GUI related settings in the guis.yml of the mods. However, there are some exceptions to that rule so it's worth checking all the config files before asking where it is.
General Settings
Every GUI comes with the same general settings.
title: 'EnvyBattleTower'
height: 3
fill-type: 'BLOCK'
filler-items:
one:
enabled: true
type: 'minecraft:black_stained_glass_pane'
amount: '1'
name: ' '
flags: []
lore: []
enchants: {}
nbt: {}
The title section of the GUI settings is what defines the text at the top of the inventory.
The height is the number of rows the GUI has.
The fill-type is how the background items are defined. You can find further information on that in the sections below.
There are currently four types of fill options for GUI settings.
Block
This will use the first item in the selection of fill items and fill every slot with it.
Config text: BLOCK
As seen in the image below:
Alternating
This will fill each odd numbered slot with the first item in the selection, and then each even numbered slot with the second item in the selection.
Config text: ALTERNATING
As seen in the image below:
Checkered
This will do a checkered pattern using the first two items in the selection.
Config text: CHECKERED
As seen in the image below:
Custom
This will fill each slot with each item in the item selection in the order provided.
Config text: CUSTOM
As shown in the image below: