The most recent updated of Ring Central removed the keypad button command that brought the keypad to the front of your window while the keypad is in a popout window.
Now, the only way to get to the keypad is through the taskbar or your window switcher. The keypad area only provides a “reattach” command if in popout mode. The command button before this update was always available above the Phone command bar and made it easy to show and hide the keypad while in a popout window.
Please work to add the command button back as it improved efficiency and workflow.