It didn’t disappear it’s probably behind your other bars. If you use Bartender or another addon to customise your UI Blizz breaks it every time they update their new system. Logged in today and the bag bar and menu bar were stacked just left of center behind my action bars and I couldn’t move them with either Bartender or the default system.
They seem to have a sick need to break half your addons every patch so that it takes upwards of a week to be able to play normally again waiting for the addon devs to fix everything.
a couple options got reset to default for some reason.
big bag became many bags
player frame and target frame had no numbers on them anymore
camera adjustment setting reverted to default instead of “never adjust”
cooldown numbers went unchecked
whispers dont show in the main chat window even if checked
then after all that i realised i raided all night without cheat death on because they moved/mixed up talents and didnt reset them - i was running around with no cheat death and some useless talents… it’s pretty silly lol
its hard to believe these guys have nearly 20 years of experience with patching this game. doesnt show at all.