When I go to insert a modern control (e.g., text input) into a blank vertical gallery, PowerApps insists on inserting it in the Container in which the Gallery sits, and not in the Gallery itself. Help please?

When I go to insert a modern control (e.g., text input) into a blank vertical gallery, PowerApps insists on inserting it in the Container in which the Gallery sits, and not in the Gallery itself. Help please?
Not only must you click on the Gallery within the Tree View, but you must also click into the gallery on the page viewer, then add the Text Input. Once I click "Gallery1" in the Tree View and then click into the Gallery on the page viewer, I can add a text input. Otherwise, it gets added to the Container as you mention in your post:
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