You have no wireless settings in Repeater Mode. The Repeater is obviously always using the Parent AP band and channel and duplicated SSID/password with option for change. There is nothing else to set there and accordingly not available in the GUI in Repeater Mode.
There's a long page of "professional" settings on the router. You're saying that the router and repeater don't need to agree on these?
If you have -30dBm to the Repeater - why do you need this Repeater? 2.4GHz clients work well to -70dBm and 5GHz clients to -80dBm.
Now you're just rambling. What did the original OP say and what was my post in response? The issue is the 5 Ghz. Please stay on topic.
No. This was a conversation in Dec 2021. I have to re-read it to see what it was about. Now is Jan 2023 and I'm answering your questions.
LOL. So what you previously said is no longer valid and you couldn't be bothered to scroll back in the thread? It's pretty obvious to a reasonable person that by "just" I meant earlier in the thread - as in a few posts ago. 2021 to 2023 doesn't represent a sea change in technology - observations about the RT-AX86U (which your comment seems to be) still hold.