How to remove Fabric Workspace

Question

I am going through the course: https://microsoftlearning.github.io/mslearn-fabric/Instructions/Labs/01-lakehouse.html

Well, it seems that Fabric is extremely raw so far. Some thing do not work like "move table to space", etc.

Latest step says:

1. In the bar on the left, select the icon for your workspace to view all of the items it contains.
2. In the toolbar, select Workspace settings.
3. In the General section, select Remove this workspace.

When I click the button I see error:

ExistingMangedEndpointsPreventingWorkspaceSoftDeletion

Very explanatory error. How to remove workspace?

After 5 tries I removed lakehouse completely. So my workspace is like this:

But it changed nothing.

P.S. at the top I see (x) (Close) button doesn't work either.