Bigger and Reorganized PalBox v1.06  

Mod Description
Vanilla PalBox have 16 pages (boxes), each can hold 30 creatures. If you you need more slots per box or prefer to have more dedicated boxes with smaller amount of slots, this mod may come in handy.
Available versions for existing and newly created characters: 480 slots (40 boxes/12 slots), 480 slots (20 boxes/24 slots), 480 slots (10 boxes/48 slots).

Mod also allows to increase number of PalBox slots, but only for NEWLY CREATED CHARACTERS (with this mod installed).
Available versions for newly created characters: 640 slots (32 boxes/30 slots), 1920 slots (64 boxes/30 slots).

Installation

Steam:
Extract UE4SS_Xinput.zip to Palworld\Pal\Binaries\Win64\ (Mods folder will appear inside Win64 folder)
Extract this mod to Palworld\Pal\Binaries\Win64\Mods (PalBoxReorganized folder should be inside Mods folder)
Gamepass:
Extract UE4SS_Xinput.zip to ..\Users\...Appdata\Local\Pal\Saved\Config\WinGDK\ (Mods folder will appear inside WinGDK folder)
(As alternative, extracting to \XboxGames\Palworld\Content\Pal\Binaries\WinGDK\ may help).
Rename xinput1_3 to xinput1_4.
In the UE4SS-settings.ini file, set bUseUObjectArrayCache to false.
Extract this mod to ...\Users\...Appdata\Local\Pal\Saved\Config\WinGDK\Mods (PalBoxReorganized folder should be inside Mods folder)

Uninstallation
Just remove PalBoxReorganized folder in Mods.

Compatibility
Works on Steam. May not work on Gamepass.
May not work on Linux and Steam Deck.

How to make it work on dedicated server (huge kudos to steve2k43):

In between restarts you need to delete the servers 'cache' files from inside the cache folder.
I have automated this through a bat file to start up the server.
del /Q "cache"
PalServerInject.exe
For those that are struggling to get it to work on dedicated, make sure you are using an injector. I use this one:
https://github.com/N00byKing/PalWorld-ServerInjector

Credits
To W1ns, Crazyon69 and AirborneMuffins for Gamepass installation routine.