Multi-control Phone and Tablet

What do I need to make this work? I have S23 Ultra and Tab S8+ both running 5.1.
How can I make them see each other? I tried with BT mouse, then what?

your question may be more appropriate if you post it in the Samsung Community Forum

They told me the same thing a week ago! They said to ask on community.smartthings!!

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What exactly are you trying to do?

this is what I am assume is meant by multi-control:

( Samsung Multi Control allows you to control your Galaxy Tab or Galaxy smartphone using a Galaxy Book laptop. Heck, you can even use a Galaxy Tab with a keyboard and mouse connected to it to control a Galaxy phone.)

so possible I am misunderstanding the OP’s question