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) Open your download of the resource pack.
2) Navigate to assets/minecraft/optifine/cem, and delete all files with "chest" in their name.
3) Now navigate to assets/minecraft/optifine/random/entity, and delete the "chest" folder in here.
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.