Oh sorry but the image you have shared is rectangular shaped. The 2nd image. I thought it was a rectangular watch.
The complication layout is automatically selected as per the complication provider. That’s why you are facing this problem.
Please check this thread: Complication text font size too small when Run On Device - #7 by r.liechty_SDR, hope it will help you.
If you don’t understand or have any questions please share.
Thank you.