How to change the Thickness of the selectbox/multiselect box?

I have a sidebar which has few select box along with 2-3 multiselect box, i just want all those filters to appear in one screen rather than scrolling, i want to reduce its thickness(not width, the height) but changing height just reduces the space between the 2 selectbox not change its actual thickness?
How can i do this?

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Can you post some pics of what you mean, please? Hard to imagine from your description.

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