How to turn OEM on in e.os

I’m trying to turn on OEM in e.os on both the S9, Pixel 5 and Lenovo Yoga Tab 3. However, there is no option on all 3 devices.
I would like to install TWRP and / or update my e.os manually. However, every installation guide mentions switching on OEM. Can anyone help me?

Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online servicesphone

oem unlock? basically https://doc.e.foundation/pages/enable-usb-debugging

If you go through the “official (or community) install doc” for each of your devices at https://doc.e.foundation/devices and click in the result page for the device on the “Command line” card with the “install” link it will walk you through.

Lots of text though

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