You have to edit the file:

/generators/arduino/blocklyduino.js

and modify the // line 93: //

'' profile[“default”] = profile[“arduino_uno”]; ''

changing ** arduino_uno ** by ** arduino_mega. **

You have to modify the file '' /utils/blocklyDuino.js '' at // line 479. //

You can find the list of blocks categories at '' LoadIds = '' line:

// set the default toolbox if none in session
if (loadIds === undefined || loadIds === "") {
loadIds = "CAT_LOGIC,CAT_LOOPS,CAT_VARIABLES,CAT_FUNCTIONS,CAT_MATH,CAT_TEXT,CAT_ARDUINO,CAT_TECHNOZONE";
window.sessionStorage.toolboxids = loadIds;
}

You can find the categories list name to write at line ** LoadIds ** in the file '' index.html '' starting // line 246 // in '' “toolboxes definitions” '' .