how to make a "plane" object have both sides rendered?

[mortal moth]

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[tribal inlet]

press F, search render sides, select inside and outside

[jaunty grove]

^^ This only works in Blockbench so if you're exporting you either need to duplicate and invert or turn off backface culling

[tribal inlet]

better if you tell them to check whether the place where they exported to have backface culling control, rather than saying this only works in blockbench, as this is not a blockbench only thing.