Are you sure the page is actually enlarged in the Android browser? My observations are that the previous scale often remains active if you simply reload the same page again and again, which may mislead you, considering that the page loads for users this way. However, using refresh / reload aside, the page will load normally during normal loading. Because of this, I would advise making sure that you go to a new page when you need to reliably check the scaling.
Otherwise, if you still have problems and your desktop has a fixed width, you can simply set the following for the viewport:
<meta name="viewport" content="width=fixed-width,initial-scale=1">
If the fixed width is the fixed maximum width of the desktop in pixels.
This will give you full width and scale according to each screen size of the mobile device.
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