Change elements position in layout. Choose from "Horizontal Layout", "Vertical Layout" or "Floating Block" in right toolbar.

Align elements in layout by selecting alignment for that layout in right toolbar.

Select layout and click background icon in right toolbar;
Choose your background layout colour and opacity;
Or upload image/video:

1. Adjust opacity;
2. Select position, choose what position picture will start from;
3. Select repeat options. Horizontally or vertically to have image/video repeat for horizontal/vertical position;
4. Select "Don't scroll background" to have background at the same position;
5. Select "Offset" to add move image/video from the starting point;
6. Select "Auto" to have auto resized picture and select if the picture will be stretched to fit to layout or fit as it is;
7. Select opacity, position, etc.

Add duplicate layouts by clicking on icon on layout you want to duplicate and choose "Duplicate".

Select layout and click border icon in right toolbar to add borders to layout and choose your width, style and colour.

Adjust layout size or "Allow to adjust size automatically" in right toolbar.