Memory Modrinth App

Give Minecraft more memory: Modrinth App

Just the Dungeon Train instance (recommended)

1. Open the Dungeon Train instance and click its Settings.
2. Go to the Sync overrides tab.
3. Turn on Custom memory allocation.
4. Set the Memory allocation slider to 6144 MB (6 GB).

Every instance (global setting)

1. Click the gear icon (Settings).
2. Under Instances, open Synced settings.
3. In Java and memory, set Memory allocation to 6144 MB (6 GB).

Then fully close the game and launch the instance again. The new memory only applies from the next launch.

Older versions of the app had a Default instance options tab, and a Java and memory tab in each instance's settings. If you see those, the setting is the same memory slider.

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Other launchers: see Give Minecraft more memory.