bug problem when pressing setting there is no choice whatsoever

repository

https://github.com/marcohc/roboto-calendar-view

Expected behavior

When the user presses the settings there should be some options. For example There is a language setting and others

Actual behavior

The fact is when the user presses settings there is no choice

How to reproduce

• Download 'roboto calendar view sample' in play store Here
• open and launch app
• tekwan fish 'option' which is above the right side of the phone screen

• click 'settings'
• and record bugs there

Device used: Xiaomi redmi 3 RAM 2.00 GB
Operating System: Android version 5.1.1 LMY47V
Application version: 1.0.1

Recording Of The Bug

proff of the work :

https://github.com/fakri96