Each Replica shown on its own on the workspace

I have the problem, that every replica I make of database is shown on its own on the workspace and so creates a mess of databases.

How can I change this to be shown only once with a drop down menu in the right upper corner of the database?

Subject: Each Replica shown on its own on the workspace

View → Stack replica icons

Subject: Each Replica shown on its own on the workspace

Richt click on the workspace - Stack Replica Icons