I solved the problem!
It was simple:
I let a timeline play when a immersive scene loaded via code(I used OnNotification).
I put the 'Disable Entity' at the beginning of the timeline.
And I could add 'Enable Entity' middle of timeline (It can be the same timeline or another one)
PLAY4
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I solved this.
Summery: Is it possible creating Vision Pro app without Share Play using TabletopKit or Group Activities?