[policy] Determine design for forms that have multiple actions

Problem/Motivation

A followup was asked for in 📌 Separate the menu settings from the 'add link' button Postponed to determine the design for forms that have multiple actions, such as admin/structure/menu.

There are existing issues in core proposing different solutions, all postponed for 8 years.

There is no standard for this at User interface standards → . Is is somewhere else?

Steps to reproduce

Proposed resolution

TBA

Remaining tasks

Determine the standard for all such pages in core to use.
When decision is made, update the related issues with the design decision

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet