@Archer crystal doesn’t have that option. they made a change to the software, you basically get predetermined render options at the moment. The 8k that I have allows for that adjustment by number value. I’ve found that it works best for me to leave the Pimax software on 1 or balanced in the case of the crystal, then adjust the steam render value down.
Adjusting that way also makes it easy to tailor each game specifically. For example, I may be able to have steam a 100% for Ghosts of Tabor but need to lower it to 86 for BMS. Although you can make that change in the Pimax software you then have to launch games through their launcher for it to take effect. Steam handles the launching of games better in my opinion since my library is a mix of standalone stuff like BMS, Viveport games and Steam games.
I’m pretty content with 60fps in all honesty, I’m impressed the rtx3070 can even do that as it is. I have an a full PC upgrade planned for in the next few months to really be able to push this Crystal to the max!