You can set the call algorithm according to the dialing sequence - random, simultaneous or sequences.
Click on the Gear icon to view the Settings page and click on Platform which will be directed to the page shown below on the screen shot.
Next step is to click on the Calls option from the ribbon list mentioned on the page.
Scroll down on the page and click on the arrow button on the Call Settings options.
Now you can arrange the Call Algorithm as per your requirement and click on Save.