It's wise to access in privacy mode for security and privacy when you work remotely on your office PC. If you haven't accessed the remote computer in privacy mode, you can blacken the screen and then disable the remote input. 

▶ Disable the mouse and keyboard of the recipient

Step 1. On your local device, go to the controller toolbar and click Operation.

Step 2. Check Disable the mouse and keyboard of the recipient.  When this option is enabled, the physical keyboard and mouse of the remote computer won't be usable. 

▶ Privacy mode

Privacy Mode actually contains three options, which not only disable the receiver's mouse and keyboard, but also blacken the receiver's screen and lock the device when disconnected. This function includes disabling remote input.

Once the device is locked, you need to initiate another remote connection from the master and then disable the privacy mode in the remote window. Or exit the privacy mode before disconnecting.

Note: Both features are available in Professional and Enterprise Edition and isn't supported by Free Edition.