Memory settings should be on the A.I. tweaker menu I believe. You want Expo ideally, or D.O.C.P. I if expo is absent.
Note, on my Strix X670e-i board at least, if you select a memory setting that the board thinks may not be valid or have too many unclean shutdowns the system will hang on memory training with ASUS claiming a CPU error is at fault. If your machine doesn't boot, reset CMOS, even if your settings are valid. I am about to engage ASUS, AMD, and poke at several reviewers on twitter and elsewhere, because this issue still is not fixed several BIOS revisions in and I strongly suspect it is not specific to my model. It initially appears that the BIOS (likely the AGESA code from AMD) is too aggressive about faulting memory issues for unclean shutdowns, and ASUS isn't properly cleaning up after the fact.
Wind storms rolled through my area here in the southeast yesterday, and my PC shut off 3-5 times, after that, black screen, chipset fan at full blast, CPU fault error LED. Note that this has been an issue since launch. Do you have any idea how hard it is to reset the CMOS on my board? I have to unplug the machine open my tiny case, pull out a daughter card, install a jumper, install the daughter card. Push the power button to ensure discharge. Unplug the daughter card, remove jumper. Install daughter card. Put case back together. Plug in PC, push power button. Wait 2-3 minutes to get to 'Your BIOS has been reset' notice, and finally, I can set all my settings again. This has been an issue since launch. It has hampered my desire to tweak timings, because guess what? If there is a memory fault from a stress test that ALSO has a very good chance of causing the black screen of death.
Miserable experience overall. ASUS and/or AMD need to get it together.