To Specify Whether a Block Reference Can Be Exploded

1. Open a block definition in the Block Editor.
2. In the Block Editor, make sure nothing is selected.
3. In the Properties palette, under Block, click Allow Exploding.
4. On the drop-down list, select Yes or No.
5. Click Block Editor tab Open/Save panel Save Block. Find
6. (Optional) If you are finished using the Block Editor, click Close Block Editor.