1. Helper: "You cannot preview the Catalog block for the selected customer group using Visibility tab" should be placed at the top of the block
2. Dropdown Default catalog - bring back "*" to mark the required field
3. Additional helper: You can select only catalogs with status "published" 
4. Empty state for this case: no catalogs and/or customer groups defined in PIM
5. Final labels: Set up customer group and catalog
6. by default, we should display a single row of drop-downs 

https://www.figma.com/file/IOpSaqACbOi70ioVDKCziJ/PIM-blocks?node-id=111%3A85795&t=t32Vbqkxf0DHzwBK-1