Thanks for clarifying! This is expected behavior. The UI elements have a specified minimum height that they adhere to. Shrinking the window won't reduce the size below their specified minimums (which are the default). The page's zoom level can be changed to adjust when needed.
Bug 2015734 Comment 3 Edit History
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Thanks for clarifying! This is expected behavior. The UI elements have a specified minimum height that they adhere to. Shrinking the window won't reduce the size below their specified minimum proportions (which are the default). The page's zoom level can be changed to adjust when needed.