@terziyski
Thank you. I followed your instructions, did a test, went into Router Mode, set up Auto Reboot, and returned to Access Point Mode. The Auto Reboot did not occur. Apparently once in Access Point Mode, Auto Reboot is completely disabled.
According to the FAQ you referred to, it looks like the AX6000 is like the Archer A6 which does not support Auto Reboot or LED Control in Access Point Mode.
There is no reason for this. If it is the default for Auto Reboot or LED Control to be enabled in Access Point mode on most other routers, then why must it be disabled on the AX6000? The security issues in TPLink routers is why I switched to ASUS and left my TPLink as an Access Point. This is further confirmation that I should never have bought TPLink. If they intentionally disable simple functions like Auto Reboot or LED Control when in Access Point Mode, it's no wonder their router security is also defective.