Thank you for getting back to us and letting us know that the options to change the summary length works well.
Regarding the header titles, by default the homepage header will use the ‘Site Title’ and ‘Tagline’ from the ‘Site Identity’ options in the customizer.
For example in our demo the homepage header title is “Exoplanet Pro Demo – WordPress demo from UXL Themes”. The actual name of that page in the editor is “Sample Page” (we didn’t rename it from the initial setup).
The other pages/posts will use the title of the page/post followed by the ‘Site Title’, so for example a page named ‘About Us’ would have the header title of “About Us – Exoplanet Pro Demo”.
If you have a page named “Home” that is not the static homepage, then yes the header will be “Home – Name of my site”. If this is the case you can simply rename the page something other than “Home” to make it look more professional.
The theme uses the standard WordPress way of outputting the headers so any plugin that also follows the WordPress coding standards to make changes to the headers will work correctly with the theme.
What is the name of the plugin that you tried?