Hi - I would suggest larger bars in the GUI of the CIQ app. I don’t use an ERG/Smart trainer so its my job to keep the bogey in the right place on the “little” bar. Its a bit hard to focus on esp. during intervals. 
Are you using a 1000? They can’t get much bigger on the 520/820 and we have single code base. Btw, on the 1000, you can switch to landscape mode and it will work, perhaps a bit better too.
Hi Armando – correct a 1000. I see the dilemma with the smaller units – will try landscape. Also approach like this https://apps.garmin.com/en-US/apps/5f064563-a5fb-42d6-9ed6-6e478df683ba might work on a smaller device. Here we have the measure slide back and forth under the target bogey.
By the way I want to say what you guys did is (CIQ app, Smart Workouts, Smart Trainer controller, tied to the math modeling strikes me as pretty awesome