Hi Alexey, Since this a mobile question, a moderator might want to move this to the Moodle for Mobile forum.
I think you're talking about the links that let you move between activities within the course, without going back to the course page? Due to the way activities work in the app, the page that you see for the activity is provided by its plugin. To implement a common control like this would require a core change to the app. You could start by filing a MOBILE issue on the tracker to discuss the feature with the developers.