Solved
Mashup UI issue

what is this bank container in tis and how can I remove this

what is this bank container in tis and how can I remove this
This is the topmost container of the mashup, you can't delete it. It contains all other containers. It's always there, you can check when creating a new mashup, there is always a container under Mashup.
Also, when you remove a container, be aware you will remove all of its children as well.
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