[Q]Facebook App Chat icon

Hello, today i got a small issue from the facebook app.
When i clean data and cache from the app, it display the chat icon where it always did (and where i like) after i login after the data/cache cleaning of the app.
Like here:


But... after i close/back off the app, it don't stay there. When i open the app again the messages icon is near the search bar
Here:


This is driving me crazy. If i clean data and cache of the app it come back to normal but once i get out of the app the UI change it self again.
Am i missing something? Is there a way to keep it as it is when i first login after cleaning the data and cache of the facebook app?

This is getting really annoying, the "old" UI still there, so i think i should be able to keep it if i wish (as i do).

Anyone knows if there is something i can do? The version of the Facebook app is v45.0.0.38.146