Reduce size of map fragment's content

I have this map fragment:

            <fragment
                android:id="@+id/map_fragment"
                class="com.google.android.gms.maps.SupportMapFragment"
                android:layout_width="100dp"
                android:layout_height="100dp" />

It looks like this now:

But I want to reduce the size of its contents as below, how do I do that?