Description of the need I'd like to give my client access to change the site logo, slogan, etc., but if I give them the 'Administer site configuration' permission, they also have access to a whole bunch of additional pages/settings they don't need to see. I think 'Administer site configuration' is too broad, and we should replace it with more specific permissions.
Proposed solution Have more specific permissions for accessing the different pages under the Configuration admin menu item, to allow for more granular control.
Alternatives that have been considered The Custom Permissions module for Drupal seems to have evolved out of a similar frustration with this issue, however it provides a UI for creating additional permissions and assigning them to paths. Whereas I'm suggesting extra permissions simply be built into core (no extra UI needed).
Recent comments
A simple way — use Field Group to create a container for fields https://backdropcms.org/project/field_group and CSS Flex оr Grid to alignment.
Layout also for /node/add/ forms?
Yes. The are several ways to do this: Install Mail System and select "Testing" for delivery in admin/config/system/mailsystem Install Maillog / Mail developer...
Prevent Backdrop from sending emails
The short answer is no, you can't theme forms or change their layouts through the UI. There is a ported version of Display Suite, which has a submodule called Display Suite Forms that allows you...
Layout also for /node/add/ forms?