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If you modify the parameters of objects, it will affect all maps. But this isn't a major issue, as everyone does it, and it has become standard practice to keep only one map in the maps folder, the one you are currently playing.
Alternatively, you can create copies of objects, give them unique names so they don't overwrite the game's resources, and then nothing will be affected.
Alternatively, you can create copies of objects, give them unique names so they don't overwrite the game's resources, and then nothing will be affected.