Claro: Dropdown menu not working

incomplete information, please let us know, how you are using claro theme, as admin theme or frontend theme? if your Menu not displayed completely or menu in dropdown is not displaying?

The image below is from my Drupal 10 site, but I see the exact same thing on my D9.4.15 sites as well. (Yes. I know, gotta upgrade.)
This snip is from the 'Add item to menu' form from Drupal core, when Claro is the Admin theme. Note I have highlighted in yellow the fact that -- probably because I am not finding a commensurate file within the Claro theme itself -- that the select element twig file (select.html.twig) is being pulled from Drupal core, instead of the theme. In any case, we can see the element's (in-line) styling, circled in red, is such that it's hidden. (Would have been more efficient to use display: none; css code.)

If Claro had a select.html.twig file, this issue might be resolved.

My situation may not apply. I just discovered a custom module -- designed to chop up the menu select field at each sub-level -- is not (currently) compatible with the Claro theme, which is why the menu drop-down was disappearing for me. Disabled the custom module, and my menu drop-down started to display correctly with Claro as the admin theme. My apologies for the confusion. I will set this back to Postponed (maintainer needs more info.)