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I think your issue solve with https://github.com/BushidoInteractive/ScrollSnapUnity and its work so smooth and also buttons are zoom-in and zoom-out.
It must be work more smooth Scale
Vector3 scale =new Vector3(0.025f,0.025f,0.025f); if (_Bttn [i].GetComponent<RectTransform> ().localScale.x <= 1.5f) {...
Admob and Facebook Audiance Network is most effective in compare in unity ads