Hi,
As your data source has both “Read all objects” and a filter simultaneously, which is supposed to be impossible, they both get disabled. We noticed that this happens if you paste a filter from the clipboard to a data source with “Read all objects”.
A way to fix this is to switch your data source to “Runtime only” to reset the filters, and then switch it back again to database connected. You will have to turn off “Initially subscribe to updates” to be able to select runtime only.