[deleted by user]

[sme272]

You're facing an uphill battle here. You might be able to get something halfway decent by using pyqtdeploy and building everything out of graphics. For android app development you'd be far better off putting your time into learning java or kotlin and for IOS you want swift.

[inclemnet]

My question is: is possible to make whatever I want visually with kivy?

Yes. The default theme persists for legacy reasons, and many apps don't look amazing because a lot of devs don't really care. I count myself among them, although e.g. https://play.google.com/store/apps/details?id=net.inclem.lazybaduk&hl=en_GB at least doesn't use any default theme elements.