how can I remove a legacy tagline?

Greetings - I have a site where I first applied another theme (“Total”) then switched the theme to Lively. The Total theme supported a tagline in the title bar, which I added, but in Lively, the tagline is not supported and there no mechanism to remove it or change it. The tagline continues to appear in searches and it the title tab for the site. Any advice on how to get rid of it would be greatly appreciated.