as Gnuserland pointed out, it's and old thing taken from the web, used to distinguish between normal text and links. In Gemini we only have link-lines, so the underline is redundant. It's still possible to restore the styling by adding something like the following in ~/.telescope/config style line.link attr underline

while there also simplify a bit the handling of the pair for tabs/current-tab.

This way, commands like toc, link-select & co will jump to the line and make that the first line in the window.

As suggested by Gnuserland, thanks!