Title being pre-filled with website title?

Yes, you can find those format fields here – https://semperplugins.com/documentation/title-settings/#title-format-fields

The piece you want to remove is the string that looks like:

| %blog_title%

However, doing so will mean you’ll need to add your business name back in using a separator or you won’t meet Google’s quality guidelines for title – https://semperplugins.com/documentation/quality-guidelines-for-seo-titles-and-descriptions/