In Prior Extinction , progress is usually saved through the game’s menu system rather than by just leaving normally. A guide for the game says to press M , open the wheel, choose Menu , and wait about 30 seconds for the game to save safely before exiting.

How to save

  • Press M to open the wheel.
  • Click Menu.
  • Wait the full 30 seconds before leaving or switching servers.

Important note

If you leave without safe logging, your dinosaur may stay in the world as disconnected instead of saving cleanly. The game’s wiki discussion says leaving without safe logging can leave your Dino in-game with a “Player disconnected” label above it.

Quick tip

If you want to keep growth or other progress, always use the in-game menu exit instead of closing Roblox immediately. That is the safest method described in the sources I found.

TL;DR: In Prior Extinction, press M → Menu , then wait 30 seconds before quitting so your progress saves properly.