I think there is must be in-store and storeview the name of my store and store view ?? it was working but now when I go to edit anything in this design configuration it does not apply on my website .. I have tried the indexing and cache flush ??
Currently, the single store mode is enabled, that's why only Global theme configuration is displayed in the design configuration.
You can disable the Single Store Mode from the Magento Admin by following below path:
Stores - Configuration - General - Select Single Store Mode to No
After disabling this setting, Store and website level configuration will be displayed.
Hope it helps!!!