Dear Raha,
We have reviewed your website. It looks like you have customized our plugin or somehow it conflicts with your used 3rd party plugins. Please let us know did you customize the plugin?
Also, we found some issues listed below that you need to fix to get working on the multi-delivery fees feature.
1. You are using an older version of FoodBook. Please update the FoodBook plugin.
2. Your google API has some permission issues. Please check out this doc https://themelooks.net/documentation/plugin/foodbook/how-to-create-google-api-key/ to provide all of this permission.
3. If your delivery area is 200km then you must need to add the last 200km delivery cost to the multi-delivery fees option. Because it calculates the fees KM to KM. Please check out this screenshot as a reference https://prnt.sc/159fdcp
Best Regards,
ThemeLooks Support Team