Drag-to-rearrange not working

[scrutinizer11]

Describe the bug
See the title.

To Reproduce
Drag any subscription to change the order or add to a folder.

Please complete the following information:

• Vienna version 3.9.3
• OS version: 10.14

Additional information:
In which version of Vienna does the problem not occur, if applicable:

Vienna 2.5 on macOS 10.9

[barijaona]

Please go to the "View" -> "Order By" menu and make sure that "Manual" is selected.