Depending on your version of Access, simply convert your MDB or ACCDB file to a MDE or ACCDE file format before distributing to the end users. No Design Views/Tools will be available to them.
WARNING! Before converting your original file, make at least one copy of your MDB or ACCDB and store it in a safe place. This will give you two copies, including the original, after the conversion. You will need a copy of the original MDB or ACCDB file anytime you need to modify the app. You can make no changes to the MDE or ACCDE files, which is the entire point, of course!
After copying the original file to a safe place, do a Compile as well as a Compact & Repair. In Design View, on versions 2003 or earlier, you'd go to Tools - Database Utilities - Make MDE File.
I don't run later versions, so if you do you'll need to use Help to locate the Database Utilities.
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