You don’t need to add the other Grid. Just all elements stacked inside the container:
To align all the buttons to the bottom, thats a possible future Pro feature – in the meantime add this CSS:
.align-bottom-button .gb-grid-column>.gb-container>.gb-inside-container {
display: flex;
flex-direction: column;
height: 100%;
}
.align-bottom-button .gb-grid-column>.gb-container>.gb-inside-container>.gb-button-wrapper {
margin-top: auto;
}
Then Select the Grid wrapper and give it an Additional CSS class of: align-bottom-button