The release adds the ability to change some styling of the GUIs.

It is important to note that:

Styling can only be used to change the appearance of the GUI.
Color of titles, name, lore.
Change the material of an item.
Change the location of items
Hide already existing items.

It cannot change the content of the GUI. It cannot change the title of the inventory, the name of the items or lore.
It cannot change the action that is taking when clicking on an item.
It cannot add random items to the GUI.

This is the first version and will probably still need some improvements.
The wiki has some examples but is not yet complete.

If you want to use this feature and have some trouble, do not hesitate to ask for help on our discord.

wiki: https://wiki.staffplusplus.org/general-information/other/styling-the-guis