The program is used in the tray (at the top where the time and icons of other programs)
Description of buttons
Round arrow - renew subscription
Plus - replace the subscription (if the current one is overdue and a new one has arrived)
Cross - minimize the application
Round button - turn vpn on / off
Wallet - view rates and pay
Bottom window - selected server / select another server
If you need to close the program, get into the settings, get into the minimalistic interface, right-click on it.