The old Viewspeed is active now, you could try again. Should be pretty close to Monitor Distance 70% though.
The FOV type will automatically change to the type the game you select uses. The idea behind changing method is so you can easily match FOV's between games that use different method. For instance if you want the same FOV in BF1 and is CSGO, select FOV Type "Horizontal Deg. | 4:3 Base" and enter 90 in the FOV field (so it is identical to CSGO) for BF1, and the output will show you what you need to configure in BF1 to match CSGO (Config FOV).