Most sections have padding that need to be reset. The padding is located in the “Design block area”. To access it, there must be a block in the area. If you’ve already removed all the blocks, drag a random block into the area so you can access the “Design block area” tab at the top of the editor.
- Reset “Padding above” and “Padding below”.
- Discard the random block.
The section will probably still be visible inside the editor, but preview your invitation or save it and test it via the link and you’ll see that it’s gone.