মাইক্রোসফট SharePoint পণ্য & প্রযুক্তি

Permission Level for the user or group can be modified to restrict the user to edit in SharePoint designer.

সাইট সেটিংস -> Advanced Permissions

Click Advanced Permissions, Select Settings -> অনুমতি স্তর

You can add/edit existing permission level.

Uncheck Browse Directories Permission level.