I have created a list button on a custom object and I set the behavior of the list button to "Display in existing window without sidebar or header".

This List button works fine in Salesforce classic, but when I switch to Salesforce lightning experience it not working properly.

When I click on the list button in Salesforce lightning it doesn't open in the existing window. It opens in a new tab. My requirment is to open the in existing window. 

Any help would be really appreciated.