Dropdown Toggle in Tablet through Portrait Mode

When I look at my smartphone and select the Hamburger Icon for my menu, the first position on my menu bar is a dropdown toggle. I notice that the menu is open and the complete list of options is displayed with no way to shrink this by tapping the right arrow. Wondered if there must be something before the drop down toggle like a Home Page or if there is a setting I overlooked.
Thank you,

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