Dont worry we will add this feature on next version, for now please use this following steps to remove styles from tag:
1> Go to themedirectory->wp-content->themes->puresimple->functions.php:
In functions.php on line no:174 you will find following code
require get_template_directory() . ‘/inc/inline-css.min.php’;
2> Replace this above code with
require get_stylesheet_directory() . ‘/inc/inline-css.min.php’;
3> Again go to themedirectory->wp-content->themes->puresimple->inc
open inc folder and copy the inline-css.min.php file and place it into following direction:
Go to themedirectory->wp-content->themes->puresimple-child
1> Create inc folder and paste inline-css.min.php inside inc folder.
4> At last remove all the code from inline-css.min.php file which you have placed inside puresimple-child theme.
Note: Though all the styled inside tag will be removed but some of your customizer functionality will not works. As well as please take a backup of your site before proceeding. Normally we use duplicator plugin to make a backup. https://wordpress.org/plugins/duplicator/.