Search Bar not occupying whole screen space

[divyank00]

Summary: Search Bar not occupying whole screen space and the edit text is closed when cross is clicked if edit text is empty

Steps to reproduce:

1. Open Help section
2. Click on search
3. Type something
4. Click on back button
5. Observe

Expected behaviour:

1. Search bar should take the full width
2. Search bar should disappear on the first press of the back button and on second press, the fragment should close

Observed behaviour:

1. Search bar takes half width
2. Search bar disappears when clicked on cancel icon if the edit text is empty

Device and Android version: OnePlus 6 Android 10

Screenshots:

https://user-images.githubusercontent.com/50913976/108688185-a2288d00-751d-11eb-93cd-45ee7980c2ba.mp4