Button difference J3 vs J4

Hi Mr Dam,
We have created a Joomla 4 test site from our Joomla 3 production site. The Edocman buttons such as VIEW EDIT are different in Joomla 4. They are white in appearance and difficult to read unless moused over. If I modify bootstrap.php in helper for bootstrap 5 $classMaps to 'btn'  => 'btn btn-primary' instead of btn btn-secondary , it fixes the problem.
Noel Adams.

If you need any helps from me, you can raise new ticket on category: Edocman
Thanks
Dam