Steps to reproduce:

• Create general empty project
• In Model Editor view, select book model
• Resize "author" column to be much wider
• Add some rows
• -> all looks as expected
• Add new Model "NewModel"
• -> Column1 width follows the width of "book" model's "author" column. Would expect that width of the column is independent from other models, maybe some fixed size?
• Select "book" model
• -> "Add column" button has disappeared from the right side of the table
• Select NewModel
• "Add row" button has moved far below, "Add column" button is not visible. Row can be dragged in weird way. Please see attached recording.