lsp-ui-doc overlaps with completion-at-point popup and lsp-ui-doc-position not working

[obsessor-ak1]

My lsp-ui-doc frame overlaps with the completions (provided by company mode). Here is how it lookes like:

And to fix this, I decided to change the position of the doc to the top via following:

(use-package lsp-ui
  :commands lsp-ui-mode
  :custom
  (lsp-ui-doc-position 'top))

But the position didn't changed I am using emacs 26.3 on ubuntu 20.04 machine. I recently installed lsp-mode on emacs. I am a beginner.

Please help me in fixing this.