In Android mobile phone, Pandanet Go runs in small screen mode. The board and the stones are SO ugly.

Before, I reverse-engineered the code to run in tablet mode: https://lifein19x19.com/viewtopic.php?f=33&t=13356 but that's so troublesome.

Please, add an option for user to select to run in:

A) phone mode
B) tablet mode

Running Pandanet Go in ugly mode on my large screen Android phone is really PITA ....

I'm not sure if I understand what you mean, "ugly" stones and fed up with reverse engineering the APK? Huh??

Still, it does sounds like a great idea to allow users to try out tablet mode if they have a large phone and the app doesn't switch to the best mode.

I noticed that there was an update to the app only a few days ago on 10 May. The only update in a long time that change anything so that I noticed. I won't list everything that was changed but the app seems a lot more responsive and the tatami mat background is gone for me. I guess I haven't tried the app on a tablet for years.

I think I remember the app was, at least initially, created by some European Go players. The links on the Pandanet website go to the Go club in Gent, Belgium, and the Dutch Go forums. Most of these links don't work but the helpfile is at http://tetsuki.gentgo.be/. Did you try the contact email on Google Play?