Hello, is it possible to have a 13 column grid ?
The underlying base grid is 24x24 and you can’t do this if you go for 2x buttons - that will give you only 12 column layout. In MGP 1.7 we will add grid resolution options including 32x32 that will enable you to create a 13 column layout - 10 3x buttons , and 3 2x buttons.
thank you
So if I understand this correctly, in MGP 1.7 we should have the ability to create 13 columns, by having 10 “big” buttons and 3 “small” buttons ?
or is there an option to make all merged buttons the same size ?
Not exactly 
— let me clarify a bit how the grid system works.
The grid in MetaGrid is built on an underlying base grid (24×24 in the current version, and 32×32 in MGP 1.7). All button sizes are defined as multiples of these base units. So a “2× button” takes up 2 base units, a “3× button” takes 3, and so on.
That means you can’t freely combine different button sizes to reach an arbitrary column count — the total width of your layout still needs to fit within the grid’s overall resolution.
When we introduce the 32×32 grid in version 1.7, you’ll have more flexibility: that resolution allows layouts that weren’t possible before, including a 13-column setup if you arrange the buttons so their combined width fits the 32 base units.
In short: the number of columns is limited by the base grid, not just by how many buttons you place next to each other.