fix(dashboard): resolve dropdown popup positioning

Author: reynoldmorel

superset-frontend/packages/superset-ui-core/src/components/Select/Select.tsx

@@ -779,6 +779,7 @@ const Select = forwardRef(
           {...props}
           showSearch={shouldShowSearch}
           ref={ref}
+          placement="bottomLeft"
         />
       </StyledContainer>
     );