Bug on Onion Browser: Can not enable "be default"

Expected behavior

If an app creates a feature in the settings that can be enabled in its application, then we can use the feature by enabling it.

Actual behavior

I tried to enable the "Be Default" feature on the browser's onion app, but I'm surprised we buttons that I press do not work properly, instead of actively displaying some options using other browsers. I tried to activate it again, but still can not.

How to reproduce

• Browser: Onion Browser
• Operating system: Android 5.1

Recording Of The Bug