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It’s not workout % intensity, that’s the set to the left of these.
It’s not trainer difficulty either as I went into settings and compared.
snoops-
This seems to imply it adjusts intensity so I assume that is the same as the "ftp bias" thing I mentioned.
https://www.smartbiketrainers.com/use-erg-mode-zwift-4293
Adjust Workout Intensity Using Zwift Companion App
Use Zwift Companion app. When in workout mode, you will see a dedicated Workout screen as you see below.
When ERG is ON, you can use the BIAS button to adjust intensity. You can increase or decrease it by +/-10%.
You an also skip a certain block but swipping left or right and tap the “SKIP” button.You can also control the intensity with the following:
On iPad/iPhone, tap the screen and a menu will appear from the bottom of the screen. You will see up/down arrows that you can use to adjust workout intensity.
On Apple TV, using the remote control, swipe up and a menu will appear from the bottom of the screen. You will see up/down arrows that you can use to adjust workout intensity.
On a PC, click the arrow up button on your keyboard to bring up the bottom menu. You will see up/down arrows that you can use to adjust workout intensity.
hippy
Is it trainer %, where you can turn up/down the resistance? Maybe not. That was in the Settings: https://zwiftinsider.com/using-the-trainer-difficulty-setting-in-zwift/
Is it in a workout? "Page Up/Down: adjust workout % intensity (aka “FTP bias”) during a workout"