From what I understand, I can only adjust my training zones based on Critical Power (CP) in terms of watts and heart rate. I’ve recently undergone several lab tests, and due to illness and injury, I need to focus on rebuilding my base at LT1/VT1. My lower power output has dropped significantly, so the standard zone distribution from CP doesn’t quite suit my current needs. I would like to manually adjust zones a bit more detailed. I’ve come across one or two posts about this topic, but the most recent one was from 2022, so I thought it’d be okay to ask again. 
Thanks for any help!
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Hey @Rab72
Sorry about very late reply.
yes, you can manually override the zones in Overview - Athlete Zones - and manually input your threshold. You’ll probably need to play with it a little bit to get your zone 1/2 match what you see is the best in relation to your current situation.
Hope this helps,
MJ
Thanks 
but then I understand that you can only change CP and then the zones adapt to that through percentages, correct? And that is not really what I wanted, but then i know
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That’s correct. Not ideal, but as you build your aerobic machine, main focus should be on lower intensities, right, and you want those to match closely where you are at. I realize this is not what you wanted. You could maybe adjust the threshold down a little bit and then do your aerobic sessions at a lower target range. it is tempting to try to hit the higher end of zone 2, but it is totally legit to go easy 
Hi Rab72; I am going through the same thing right now - I have to keep my HR under 110, ideally 100, for the next ~3 months which is not even close to my prior thresholds! So, I manually typed in my Critical HR as 110 and set a fake race 9+ months out in order to get base weeks which are longer and lower intensity.
And totally agree/understand, the percentages aren’t perfect but it gives me something to go on. You/I can always use the workout wizard under injury or fatigue to get a different workout if the prescribed one is HIIT for example (I’ll be hanging out with the wizard for a while myself).
Reach out anytime if I can also be a reference!
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Thanks. Right now I adjust a bit “on the fly”. Your solution is better since algorithm suggests more specific
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Nice - keep me posted and good luck