Google Drive - Remove Sharing & Access Permissions from folders, subfolders and files. Note that Google Apps Script commands can be changed after this version.

reset.gs

// Note that this script will remove all permissions of all files and subfolders
// (including files in subfolders) of the given folder

// https://drive.google.com/drive/folders/abcdefgh
const id = "abcdefgh";

function start() {
	const folder = DriveApp.getFolderById(id);
	getSubFolders(folder);
	// At the end, reset for parent folder
	resetPermissions(folder);
}

// Get subfolders recursively
function getSubFolders(parentFolder) {
	const childFolders = parentFolder.getFolders();
	handleFiles(parentFolder);
	handleFolders(childFolders, parentFolder)
}

// Handle files in a folder
function handleFiles(folder) {
	const files = folder.getFiles();
	if (files.hasNext()) {
		Logger.log("Files are found in " + folder.getName());
		while(files.hasNext()) {
			resetPermissions(files.next());
		}
	} else {
		Logger.log("No file in " + folder.getName());
	}
}

// Handle subfolders of a folder
function handleFolders(folders, parent) {
	if (folders.hasNext()) {
		Logger.log("Child Folders are found for " + parent.getName());
		while(folders.hasNext()) {
			const child = folders.next();
			resetPermissions(child);
			getSubFolders(child);
		}
	} else {
		Logger.log("No more subfolder in " + parent.getName());
	}
}

function resetPermissions(asset) {
	try {
		if (asset) {
			Logger.log("Name: " + asset.getName());
			removeSharing(asset);
			removeEditPermissons(asset);
			removeViewPermissons(asset);
		} else {
			Logger.log("Not found! -error");
		}
	} catch (e) {
		Logger.log(e.toString());
	}
}

// Set sharing options for the asset (file or folder)
function removeSharing(asset) {
	asset.setSharing(DriveApp.Access.ANYONE, DriveApp.Permission.NONE);
	asset.setSharing(DriveApp.Access.ANYONE_WITH_LINK, DriveApp.Permission.NONE);
}

// Remove all users who have edit permissions
function removeEditPermissons(asset) {
	const editors = asset.getEditors();
	if (editors.length > 0) {
		editors.forEach(editor => {
			const email = editor.getEmail();
			if (email != "") {
				asset.removeEditor(email);
			}
		});
		Logger.log("Editors are removed!");
	} else {
		Logger.log(asset.getName() + " does not have any editor");
	}
}

// Remove all users who have view permssions
function removeViewPermissons(asset) {
	const viewers = asset.getViewers();
	if (viewers.length > 0) {
		viewers.forEach(viewer => {
			const email = viewer.getEmail();
			if (email != "") {
				asset.removeViewer(email);
			}
		});
		Logger.log("Viewers are removed!");
	} else {
		Logger.log(asset.getName() + " does not have any viewer");
	}
}

Tutorial please. I am new in this thing.

I believe you can find one on YouTube. The description states that Google Apps Script commands can be changed after this version. Therefore, this script might not be working

Great starting point thank you

Excellent, thanks 😍

You are just a genius!! Thx x 1000000000