.env.development.local
that contains the below configuration.
REACT_APP_BUILD_TARGET
environment variable can be set to either app
or app-ui-builder
.
REACT_APP_BUILD_TARGET
from app
to app-ui-builder
and re-run the base theme. You should see the base theme with Draggable area on left side and Visual Builder Panel on right side to drag-and-drop the possible components.