Backdrop community pay a lot of attention to UX issues. And it is priceless. As a result Backdrop is several steps ahead of Drupal (and many other CMS) in terms of UX.
I would like to propose new UI button group component for Backdrop. It is select component which act like radio buttons or checkboxes. You could see it many times before all over the internet. It is present in bootstrap css/js framework.

It is perfect solution when you have just few options to choose. Its main advantage that you can see all options immediately without additional clicking. Button group needs one click less than selectbox to provide action.
Here's how it might look on Manage content page. Both options are chosen. It is analog of "- Any -" option.

Here's one option chosen.

Manage user accounts page.

This component can be used widely. It is just a sketch. Styles needs to be discussed.
Recent comments
well @herb I cannot believe it, but the webform module was there in modules on the disc, but missing in the listed modules, so I delete the module folder, and downloaded it again. Then...
My Webform Worksheets have disappeared
The only thing I can think of is to make sure Webform module is enabled and that the content type that needs to contain the webforms has Webform enabled for it. Edit the content type and make...
My Webform Worksheets have disappeared
@yorkshirepudding, In the end I fixed it by deleting the config/active folder contents, copying the config/staging/ files into config/active, importing the database again and clearing the caches...
Importing the staged config throws an error: another field with the same name already exists