So when you have a map open, then you open a second map, you can switch between the 2 using the Window >> then select the other map.
Is it possible to close ONE of the maps without closing out of the editor altogether and restarting?
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I believe it's file-close that exits the currently active file.
If you close one map, the editor will automatically switch over to the other map you've currently open in the editor.
In reply to MaskedImposter: