For training, allow adjustments to increase or decrease FTP effort on a phone
While training it is helpful to adjust the FTP up or down while riding. This helps adjust intervals as fatigue sets in. It also allow to fine tune power zones to heart rate zones. The idea is to have the ride on a large device and also allow another device to view the ride while it is in progress and make adjustments. If you are using a PC to run TrainingPeaks Virtual, if an adjustment is needed, you need to get off the trainer, make the adjustment, and start riding again.

Thank you for your suggestion, and support for TrainingPeaks Virtual.
You can already change the percentage effort on mobile devices (and all other platforms) by clicking on the action bar at the bottom middle of the screen and then selecting the + or - buttons to increase / decrease difficulty accordingly.
If you have a keyboard, then you can also use the + / - hotkeys directly.
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Marie Cristine Kaptan commented
Thank you, I had the same question. While I realize that it’s possible to adjust the intensity on the screen that is used for the workout, for me this is too far away to reach while I’m on the bike. So I would need a possibility (like Zwift Conpanion) to have the same workout open on my phone directly next to me and adjust intensity from there. That’s not available correct?
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Ryan Yates commented
I think you can do this now. You can press +/- to adjust any interval (there are buttons for this on the mobile apps)