Hi @mdavies. While there is not a way to completely deactivate the siren, we can figure out a workaround for it! My first recommendation for this is to have your entry/exit delays to be set to the maximum. That way, you have a longer time to avoid the siren from going off. You can edit these under the Ring app > Settings > Modes > Home/Away (go one at a time) > Entry/Exit Delay (edit one at a time) > 180 seconds. You have the option to put these both at 3 minutes, so that way you have that long of a time to disarm the system before the alarm is going off.
In addition, you can go under the Settings > Modes > Home/Away > Sensors and disable all sensors for both modes. Disabling all sensors means that nothing can “trip” the alarm, but I believe you much have at least one sensor monitored in a mode in order to swap to said mode. Feel free to test this and verify that for me!
Lastly, if your siren does go off, you can always muffle it if you need to. I believe there may be some DIY ideas you can find for this, as it would just be muffling the speaker where the siren comes out of on the top. Please share what seems to work best for you in case other neighbors that want to explore this option also come to your thread!