When I call $ xcrun simctl runtime remove <identifier> ´´´ then I get the help screen for the command - it's xcrun simctl runtime delete :)

Thanks for the tip, but those commands do seem to help. When I try the first, I get this result: $ xcrun simctl runtime list == Disk Images == -- tvOS -- tvOS 18.4 (22L254) - C5A9C190-ABF9-4949-9112-D063E82ECA5B (Ready) -- watchOS -- watchOS 11.4 (22T250) - EB2C6365-BB36-4E19-99C2-0CE20CDD3C96 (Ready) Total Disk Images: 2 (8.5G) There is no iOS runtime installed, that I could delete …

Thanks for your help. I saw those mounted disk images in Disk Utility. But ejecting them does sadly not resolve my problem.

The DataSource is owned by the ViewModel, which is a parameter in creating the ViewController and the data source is assigned to the CollectionView in viewDidLoad … nothing fancy.