These are the required Fabulously Optimized settings for New Default+:
Using Fabulously Optimized and are having issues with chests? Follow these five steps to fix it:
1) Find "Entity Model Features" in your mod settings.
2) Click the configure icon at the top-right (the button with the three lines).
3) Go to "Models", then "Options & fixes", then turn "Enhanced Block Entities (EBE) Mod patch" OFF.
4) Go back to your mod settings page, find "Enhanced Block Entities", and click the configure icon.
5) Turn ON the "Enhanced Chests" setting, and click "Apply" at the bottom.
Using Fabulously Optimized and armor & elytra renames aren't working correctly in 1.21.5 and above?
1) You must install the Variants CIT mod and add it on top of your Fabulously Optimized.
2) Download Variants CIT for the correct Minecraft version from here.
3) You can add Variants CIT to your Fabulously Optimized mod pack most easily via the CurseForge app that you likely used to install Fabulously Optimized.
4) In the CurseForge app on the "My Modpacks" tab, click on the instance of Fabulously Optimized that you want to add Variants CIT to.
5) Click the 3 Vertical Dots to the left of the orange play button, and select "Open Folder".
6) Inside the folder that pops up, open the "mods" folder.
7) Drag the Variants CIT file you downloaded into this folder.