Hi are you talking about this plugin for Mac and PC the plugin is 5.3 compatible
MultiScreen in Code Plugins - UE Marketplace (unrealengine.com)
If so you must unload/untick this from your project, download the update version from Marketplace, then tick/enable the plugin.
Lots of documentation is at
Search - Split Screen Unreal Engine UE5 and UE4
There are video but not sure as dont have a MAC,
Unreal Engine 5 Split Screen Survival Series #3 - Starting On Interaction #unrealengine #ue5 - YouTube
Update from Publisher is vague
I can't install the plugin on the 5.3 version of the engine for Mac os.
By Manking-1 on September 16, 2023 11:58 AM
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Hi! I can't install the plugin on the 5.3 version of the engine for Mac os.
It was installed correctly on version 5.2.
In the windows version, version 5.3 is installed correctly.
Latest Answer from Publisher
By Ivan Elizarov on September 16, 2023 12:02 PM
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Hi!
Please send image problem to mail Lenina62-ivan@mail.ru, need look. You closed Epic Games? Open Library and install 5.3 version?