1/ Please provide a screenshot.
Check settings in XStore > Sales Booster > Floating Menu.
2/ Description content is edited using Elementor, for example – https://prnt.sc/Y9BDnVRXIUEN , so you need to edit the settings of content depending on your needs.
4/ You can find settings for buttons in Theme options > Styling. Add to cart button settings are in Theme Options > WooCommerce > Single product Builder > Add to cart.
5/ Please go to: your site URL/wp-admin/admin.php?page=et-panel-patcher
and apply path #9050140 – https://prnt.sc/0dZKqsOYYJpr
Then navigate to XStore > Theme Options > Woocommerce (Shop) > Shop > Shop page Layout > Product Added Notification Type and select the option that best suits your needs.
6/ Please provide screenshots for a better understanding of your request.
You can use Lightshot screenshot or Gyazo tool to make screenshots and share the links here, or you can use a file sharing service such as WeTransfer https://wetransfer.com/
7/ Text transform can be changed via Theme Options > Typography.
