Open up Call Panel in Google Chrome browser and login.
Left click on the 3 dots on the right side of your browser window and click on Cast, save and share > Install page as app...
A popup pormpting you to confirm the installation of the webpage as an app will get displayed, just click Install to proceed (first you can change the name from Call Panel to any other name is so desired)
A dedicated Call Panel window without any of the normal browser bars and menus will now get opened
This action will automatically create an entry in the Start Menu, an Desktop shortcut.
You can also "Pin" the new window to the Taskbar
Mac Setup with Chrome
Open up Call Panel in Google Chrome browser and login.
Left click on the 3 dots on the right side of your browser window and click on More Tools > Create Shortcut
Give it a Name and check the box that says Open as window and press the Create button
You can now open call panel from your Mac as any other application you have installed
It will open in a dedicated window without the normal browser settings.