Hi @Yuki.O,
You need to turn on the ‘Sticky while scrolling?’ toggle. Read here : Sticky While Scrolling | Adalo Resources (JA : スクロール中の固定 | Adalo Resources (日本語) | Adalo Resources)
Also in responsive apps you don’t need to group all the components along with the rectangle/container, like did in the legacy builder. Instead, you can group those components under the rectangle/container. Read here : Grouping Components | Adalo Resources (JA : コンポーネントのグループ化 | Adalo Resources (日本語) | Adalo Resources
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Thank you and have a great day!