Thank you @wolfgirl42!
As @SammysHP said, going directly from the Tactical Group (TG) to Extended Simple UI (ESUI) is not possible.
The confusion came about from trying to figure out why it was that when I was leaving the TG, I would go directly into a turbo mode setting that I couldn’t change. I just assumed I was in ESUI because I was so overwhelmingly tired!
What actually happened is that while moving in & out of the TG to test if I had setup the 3 TG slots the way I wanted, I had unknowingly gone into the Ramp Configuration Menu (RCM) and set the stepped ramp to Momentary Turbo (MT). Again, the result of “pressing the switch too often while tired”!
With a refreshed mind this morning, I figured out my mistake and changed the stepped ramp from MT to my preferred 10 steps. I also took the time to get comfortable with setting up each of the three Tactical slots that require 150+ switch presses.
As I’m sure others have found, the key to accurately ending the long string of switch presses required to set a particular Tactical Mode for each slot, is to develop a “switch press rhythm”.
With practice, I found that long-pressing (=10) x 15, plus an additional 1, 2, 3, etc., to end exactly on 151, 152, 153 etc., is not as difficult as I had first believed. The trick in developing a rhythm to these long strings of switch presses is being focused with no distractions!
*TIP: Because Andúril-2 is complicated enough for “newbies”, don’t try to figure out a setting(s) while you’re so tired, that you can’t focus. Doing so can lead to complicated mistaken settings, followed by overwhelming frustration, and quite possiblly incorrect assumptions. A-2 requires practice in setting up, especially for those without much computer-related experience!