Positioning a small, unique control, next to a very large one

I have a really small UI control that looks strange next to a very large one.

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enter image description here

This small control is what allows me to select the data to present in the list view.

The button on its right, opens a selector to allow me select another object.

It looks a bit weird to have such a small control next to a very large one.

I tried the following but without success:

  • add a label before it but it isn't aligned anymore with any of the corners (looked better)
  • expand it to full width, terrible because the button to open it is at the very right of the window

Please note that I have no way to change the design of control in itself.

Any suggestions?

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