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I am using Magento 2.2.5. When I enable single store mode the Page Title Prefix not working. But If I disable single store mode than it's fine. Am I missing something? Thanks.
Page Title Prefix
You can change that using Database use this query to search the value in core_config_data table and look for "Store" Scope you can change prefix/suffix there. Clear cache and it should work.
SELECT * FROM core_config_data where path like '%design/head/title_%';
Required, but never shown