To access another PC remotely over the internet using AnyViewer, normally, you don't need to adjust the settings after installing and running the software. However, to better use AnyViewer, let's take a look at the Recipient Settings. 

On the main interface of AnyViewer, go to Settings and choose Recipient.  Then, you can see the default status of the Recipient settings.  

Default Recipient

There are two options: 
✔ Allow to accept remote control: Allow this PC to receive a control request from another device and the request needs to be confirmed manually on this PC.
✔ Allow temporary security code: Generate a temporary security code automatically and allow this PC to be controlled by inputting a temporary security code. You can send your partner the temporary security code for remote support.

By default, the options are enabled and you can access this computer by sending a remote control request or inputting a temporary security code.  And the temporary security code is initially set to be changed every time the software restarts. You can click the inverted triangle icon and switch how the temporary security code changes.  If you disable the first option, this computer won't be able to be accessed via remote control request; if you disable the second option, the generated temporary security code will disappear and this pc can't be accessed via temporary security code.

Enabel Temporary Security Code