How can i design my GUI on this app

Answer 1

Only web guis are possible here.

Answer 2

You can use Brython.

That's a thingy that allows you to use Python instead of Javascript and make a GUI with HTML and CSS.

https://code.sololearn.com/W5v76nCjupV7/?ref=app

Answer 3

You can't do that in this app since sololearn doesn't support graphical libraries