Controlled Folder Access in Windows Defender Security Center reviews apps that can make changes to files in protected folders. Controlled Folder Access protects your files and folders from unauthorized changes by unfriendly applications. Your Documents, Pictures, Movies and Desktop folders are protected by default. You can block other folders manually and whitelist trusted software to access your locked down info. Occasionally, an app that is safe to use will be identified as harmful. This happens because Microsoft wants to keep you safe; however, this might interfere with how you normally use your PC.
Step 1: Select Start > Settings .
Step 2: Choose Update & security > Windows Defender.
Step 3: Select Open Windows Defender Security Center.
Step 4: Select Virus & threat protection, then choose Virus & threat protection settings.
Step 5: Under Controlled Folder Access, turn it on or off.