It's easy to ensure that your DropCall365 service is only active when you want it to be.
Firstly, if your phone has a night mode, then the app will respect this and stay quiet during your night mode times. In addition, you can set any or all of your lines into do not disturb mode whenever you choose.
To do this, go to your keypad screen and tap the name of your account at the top left. This will bring up a DND screen. You can either use the switch at the top right to set all of your lines to DND, or to just DND one line, slide the name of the line to the left and press the DND option that shows up. Reverse this to switch the line back on again. You can easily see if your lines are in DND status on your keypad screen