After updating theme settings are gone
First make sure you are running the latest version of ProStyler
Its most likely that your settings are still saved however your site is not displaying as it was before because the settings were not applied to the theme.
Simply do the following and it should be alright.
1. Go to wp-admin > ProStyer
2. Scroll to the bottom of the page
3. There you will find the link “Click here to force regenerate stylesheet”, click it and wait till page loads
This will regenerate the css (theme style sheet) with your settings
Please remember to clear your browser’s cache and/or refresh your site twice so latest changes are shown.