In order to improve the game's visuals, PC gamers can try a little simply guide made by cdub4784, it apparantly fixes the the downgraded look of Battlefield 1 (and should work).
Additionally, These steps can be taken to force the workaround
1- Open battlefield 1 in My Documents
2- Open Settings folder
3- Delete everything, EXCEPT PROFSAVE and PROSAVE_backup, these files is your campaign gameplay and has nothing to do.
4- Enter the game
5- set the quality to ultra, or whatever you had before
Additionally, Changing the settings to Auto prior to joining a server from the main menu, And then Joining a server with the settings on Auto and then changing to Ultra upon joining also can force the workaround. More in this thread.