Changing created material order

hello everyone,
i created a group of materials named from M1 to M30 and put them in a folder in the Sketchup materials folder, but they don’t appear ordered like M1 M2 … M10 M11 … but they appear as M1 M10 M11 M12 …M2 M20 M21 … how can i make them appear ordered from M1 to M30 normally ?
thnx a lot

The names are strings and they sort in alphabetical order not numerical order. I don’t think you can change this aspect of the GUI, you will have to rethink your naming system.

That’s a standard numbering system common to all forms of numeric formatting.
You need to add a 0 to get the order the way you want. M01 to M30