In JANDI, you can set notifications for each Topic.
Click the bell shaped icon next to Topic name to turn on/off notifications.
Tap [☰] on the top right corner of the Topics tab and Topic Info page will be shown.
But, you can't turn off notifications for 1:1 Chats and Mentions(@). For Mentions(@), when someone mentions you in a Topic and your notification is turned off, a push notification will be sent regardless of that Topic's notification settings.