How to fix dataset if removed joined dataset before removing the join?

I have my main dataset (left side). I then joined an excel file which is 2 columns, caseID, and casestatus. They are are ‘Live Loans’, so i was basically using this to filter to show all data from my first dataset to live loans (for other sheets). I then realised i forgot another column so i removed the dataset from my datasets, and now when i try to remove it from the join i get an error. In addition, none of my data is loading and has broken it.

When i try to remove it:

  1. Edit your dataset and click the icon to the left of Save & Publish
  2. Click “Publishing history”
  3. Click “Revert” for the version of dataset that you wish to restore

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