Multiplayer Play Mode (MMPM) is Unity's official solution for local multiplayer testing, available from Unity 6.
Pros
Short iteration times
Tighter integration within the Editor, doesn't require multiple (standalone) Editors open
Cons
Requires Unity 6+
Can be more resource demanding than just running builds
Install MPPM as described in their Installation Instructions
Open Window > Multiplayer Play Mode
Enable up to 4 virtual Players
Make sure that the baked data is up-to-date before starting to test, and that the Replication Server is running with the latest schema
Enter Play Mode
coherence tells apart virtual Players from the main Editor, so it's easier for you to not edit assets in clones by mistake.
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