Extension configuration
In order to change general extension settings, go to Stores ➔ Configuration
➔ Swissup section ➔ SEO Suite ➔ Metadata Templates.
Metadata Templates settings have two sections.
General
In section General you can enable/disable extension. And you can force your store to use generated metadata instead of metadata from product/category.
Optimize metadata
There are some recommendations how to get optimal metadata for website. And this config section helps you to meet this recommendations. Optimal length for page title is 70 characters (but you can set any length your need with respective config option). Similar is for meta description. Recommended length for it is around 170 characters.