When using Layout Builder + Umami JSX, the "Remove section" off-canvas opens properly, but when submitting the form to confirm "yes, I want to remove this section", the section is not actually removed. Fixing this may require overriding some Ajax functionality, see below for core Ajax-related files that are already overidden by this theme, and are probably the place the solution to this issue will be implmemented.
Files to note
ajax.process.js takes AJAX-added code and hyperscriptifys it. The hyperscriptified results are thensent through Drupal behaviors dialog.ajax.modified.js and ajax.modified.js are copies of core's dialog.ajax.js andajax.js that are used instead of the core versions. Some JSX Umami specific changes were made in those files, but most of the code is identical to the core verions.Postponed
1.0
Umami JSX Demonstration Theme
#3432283: Layout Builder "Add Section" does not have submit button → will fix this issue also, as both of them were having a similar problem. Once that issue is merged this will also start to work.