obsidian-excalidraw-plugin/ea-scripts/Grid.md

/* Download this file and save to your Obsidian Vault including the first line, or open it in "Raw" and copy the entire contents to Obsidian.

The default grid size in Excalidraw is 20. Currently there is no way to change the grid size via the user interface. This script offers a way to bridge this gap.

See documentation for more details: https://zsviczian.github.io/obsidian-excalidraw-plugin/ExcalidrawScriptsEngine.html

*/
const grid = parseInt(await utils.inputPrompt("Grid size?",null,"20"));
if(isNaN(grid)) return; //this is to avoid passing an illegal value to Excalidraw
const api = ea.getExcalidrawAPI();
let appState = api.getAppState();
appState.gridSize = grid;
api.updateScene({
  appState,
  commitToHistory:false
});