This is not mandatory… You can look at this configuration
All those sections are configurable. You can choose to create a custom (dashboard) with required sections. https://bahmni.atlassian.net/wiki/display/BAH/Configure+Patient+Dashboard
You can always search a patient by id and name. Please use “All” tab to search the patients.
All these tabs are configurable. Based on the defined criteria, patients show up in respective tabs. https://bahmni.atlassian.net/wiki/display/BAH/Configure+Patient+Lists
Which database are you using ? Probably, you might have default demo database that was installed. So, this is showing up. Ideally you should start with fresh database. So you will not have any of these demo data.
Most of the items are customizable. Please look at https://www.youtube.com/watch?v=x15BLsKtvdY https://bahmni.atlassian.net/wiki/display/BAH/Create+a+New+Observation+Form
https://bahmni.atlassian.net/wiki/display/BAH/Patient+Registration+Module