Default All Product Custom Options to Store 0

If the custom options of a product are the same across stores, but somehow there are not defaulted to store 0, the method below will default all custom options to store 0:

admin > product page > Custom Options > Change to other store > F12 to bring up the dev tools > in console > run

Copy$$('.product-option-scope-checkbox').each(function(e){e.checked=true;})

Or

Copy$$('input[type="checkbox"]').each(function(e) {	e.checked = true; });

Then save. Repeat for other store views.

In DB, the entries in the product option tables should reduced.

Delete in DB

Warning: delete at your own risk!

This will delete all options in all stores except the default store 0.

CopyDELETE FROM `catalog_product_option_title` WHERE store_id > 0;
DELETE FROM `catalog_product_option_price` WHERE store_id > 0;
DELETE FROM `catalog_product_option_type_title` WHERE store_id > 0;
DELETE FROM `catalog_product_option_type_price` WHERE store_id > 0;