Elite evo trainer (Decathlon special) and changing gears

I've got an Elite Evo smart trainer and I've used it for several years and I'm actually wondering if I'm using it right....
By the way, I don't use Zwift or anything like that, just the Elite app on my phone. I tend to watch stuff on my tablet whilst training.
So, using the Elite app I have various training sessions, power vs time, that I run. Most of the time I don't change gears, just keep in the same gear and push harder. I think that I'm correct in saying that the trainer I have doesn't have ERG mode so I should or can change gears if want/need to?
The reason I ask is that the maximum power (watts) I can push seems fairly low and I'm wondering whether by not changing gears I'm restricting myself artificially?
By the way, I don't use Zwift or anything like that, just the Elite app on my phone. I tend to watch stuff on my tablet whilst training.
So, using the Elite app I have various training sessions, power vs time, that I run. Most of the time I don't change gears, just keep in the same gear and push harder. I think that I'm correct in saying that the trainer I have doesn't have ERG mode so I should or can change gears if want/need to?
The reason I ask is that the maximum power (watts) I can push seems fairly low and I'm wondering whether by not changing gears I'm restricting myself artificially?
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If the resistance doesn't change on the turbo itself, then you use the gears to do that.
If it doesn't have ERG then you might want to shift gears to keep your cadence the same/similar.
2020 Voodoo Marasa
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
If it keeps you to a certain power according to the session on the app... that sounds like erg mode.
Say I'm at 200w and my cadence slows down then it gets really hard to pedal and conversely at a lower power I can really up my cadence.
It does sound like it is ERG (???), I'm just surprised as it was a cheap (ish) trainer from Decathlon.....
That looks like the resistance can b changed via that cable which, presumably,has a bar mounted control.