That is a preprogrammed remote, you're stuck with whatever's preset by the built-in code. Its not a learning remote where you could teach any missing commands.
There are some Universal remotes like the Inteset 422-3 or the One-For-All urc-7880 that allow you use advanced codes, these are 5 digit codes for individual commands like the option key. For the Onn Roku tv, the preset code in the above remotes is 14398, the option key is 00254.
Edmund
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