Xcode storyboard delegate datasource scenes
Try renaming the controller to whatever you want it to be:
Step 1 Select the "controller", named "Delegate" in your screenshot.
Step 2 Click again on "Delegate", or press [Enter] to enter renaming mode.
Step 3 Rename it to something meaningful.
Step 4 Deselect or press [Enter] again to save the changes. The scene name will be updated to match the name you specified.
Select View Controller
-> Identity Inspector
-> Document Label
and rename it here.
This worked for me.