@ddd200
There are two blocks Cheeseburger menu and Cheeseburger menu trigger....

@ddd200
There are two blocks Cheeseburger menu and Cheeseburger menu trigger.
So we need to place Cheeseburger menu first then that block name will list in Cheeseburger menu trigger block as a radio button on the block to trigger field.

There is no clear description of it, So we decided to add a description on the field for the same.
Please read the description in Place to triggerfield.