For Ultimaker2, it's best to use "ultigcode" mode which allows you to control the temperature on the machine itself.
For Ultimaker Original you *must* use normal gcode mode which allows you to control the temperature in Cura.
Switching between machine types in Cura makes the temperature appear and disappear in the gui.
Even for UMO prints I set temperature to 0C and controll it on the machine instead.
Your basic tab should have 5 headlines marked in bold:
- Speed & Temperature
Speed and Temperature should have settings for... Well... Speed and temperature...
It sounds like maybe you are in basic settings mode... Which you shouldn't use... Do you have a button somewhere that says "Switch to full settings"?
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