To view tasks in other Zenkit products such as To Do or Base, you'll first need to make sure that you have installed those products.
Click to open the task list. At the bottom, you'll see the option to open the list in other products. By default, you'll see the option to view the task in To Do, however if you've connected a resource from another product to Zenchat (e.g. a collection from Base), then you'll see those options too.
Clicking on one of those options will open the task list in that app in your default browser.