Claro theme + field_group seems to hide content of dropbutton

Problem/Motivation

When using the Claro theme with paragraphs and field_group, it can result in not being able to select paragraphs in the dropdown on node creation and edit pages.

Steps to reproduce

Install modules:

• paragraphs
• field_group
• claro (theme)

1. Create a few paragraphs (about 3-4).
2. Create a content type with a paragraph reference field. Make it so all paragraphs are selectable.
3. Add a field_group tabs (vertical) and tab.
4. Put the paragraph field created in step 2 under this tab.
5. Try to add a page with paragraph 4.

Result: Not able to select some items in the dropdown because they are hidden due of the overflow.

Expected: Be able to select any item in the dropdown.

Note that this issue is only at certain widths because of the media rule (@media screen and (min-width: 85em))).

Proposed resolution

Remove overflow: hidden; in @media screen and (min-width: 85em) in claro/css/components/vertical-tabs.css and adjust the vertical-tabs widths.

Remaining tasks

1. Create patch for 9.3, 9.4, and 10
2. Review patch
3. Test patch
4. Commit

User interface changes

API changes

Data model changes

Release notes snippet