Reset twenty twenty three theme

Hi

I was looking into the full site editing features

Now that i apparently messed up after playing with the design, i would like to go back to the theme files afresh, with original header, footer and menu

Even after i delete the theme and reinstall, the data stored in the database perhaps puts the theme to where i left previously. Is there any possible way i could purge the contents of the theme, and start with the factory default options ?

Thanks