You can allow your chat window to be open only in pop-up when the visitor clicks on specific button or link on your website. This can be acomplished by following the steps below:
1. Click on Settings > Advanced.
2. Turn on Show only in pop-up and click Save.
3. Add css class popupLiveSupportiChat to the button or the link which will open the chat window.
4. You're done!
For example if you have a button on your webiste and you want when somebody clicks on this button to open your live chat then you need to do the following:
<button class='popupLiveSupportiChat'>Live Chat</button>