Layout Builder should use the toolbar modes system once it exists
Idea for layout builder using toolbar modes.
#Layout
Issues
Allow changing the layout of an existing section in Layout Builder UI
Allow changing a section's layout.
[Discuss] Let Contextual Links show up within Layout Builder regardless of permission settings
Decide how to handle permission overrides for contextual edit links in layout builder.
Re-evaluate whether Contextual Links are the best interaction for configuring/moving/deleting blocks in Layout Builder
Layout builder contextual edit link UX discussion.
"Unsaved changes" message incorrectly appears on layout builder
If you open the layout builder editor for any entity type or entity, it will trigger the "Unsaved changes" message next time you...
Use layout builder for content add/edit form
Discussion on how to integrate layout builder with the edit form.
Allow layouts to provide dynamic regions
Layout section wrappers and config.
Add visibility control conditions to blocks within Layout Builder
Allow layout builder blocks to display conditionally.
Make it possible to add relationships to layout builder
This would be huge, currently you can't add a field from a referenced entity.