When saving the TUI renderer setting, the confirmation message now includes the name of the renderer that was chosen:
Before: "Background sessions always use the fullscreen renderer so scrolling and mouse work when attached. The tui setting applies to sessions started directly with claude."
After: "Saved. Background sessions always use the fullscreen renderer while attached; the <renderer> renderer will apply to sessions started directly with claude."
Evidence
Renderer save confirmation (search for "renderer will apply to sessions started directly with")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.