Theoretically this mod supports ALL modloaders!
Introduction
In 1.19 and newer Minecraft versions, Minecraft will automatically open the "Create New World" screen on clicking the "Singleplayer" button if there's no existing save.
The process above might be very slow if many mods are loaded, resulting in users who mistakenly touch this button having to wait a long few seconds.
This mod lets Minecraft display an empty world selection list screen even when there is no existing save, like in versions prior to 1.19.
Showcase
When you click "Singleplayer" without any save existing:
Without the mod:

With the mod loaded:

ATTENTION
- You DEFINITELY CAN add the mod to your modpack;
- The project adheres to Nova Relay License 1.0.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.19.3, 1.20.2, 1.19.4
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
OWorld2Create is a free Minecraft Java mod. Compatible with Minecraft 1.19.3, 1.20.2, 1.19.4, 1.19.2 and newer. Downloaded 2,616,303 times (via CurseForge). Download it and open it directly in the game.