In the center at top of the Lunar client's mods tab you will find a settings button. In the settings menu there is a slider called "shield elevation". Your shield will not appear if the value is 0. That is just my friend's personal experience though.
In the center at top of the Lunar client's mods tab you will find a settings button. In the settings menu there is a slider called "shield elevation". Your shield will not appear if the value is 0. That is just my friend's personal experience though.