Right now, our page <title>:s in the TAG are these very excessive things: > Printer Features — The ThinLinc Administrator's Guide 4.14.0post build 3293 documentation This is very likely to be cropped in usage, so it really should be a more sensible length. Most things will likely crop from the end, though, meaning the important parts are likely not hidden. For comparison, the same page had this title before the switch to ReST: > Chapter 5. Printer Features Much shorter, but lacks any reference to ThinLinc so is likely a bit too short.
Most search engines truncate titles containing more than 70 characters. Incomplete and shortened titles look unappealing to users and won't entice them to click on your page. For more information, please see this Google article: https://developers.google.com/search/docs/appearance/title-link
Another interesting aspect here is that the HTML titles do not work especially well in search engines. For example: https://www.cendio.com/resources/docs/tag/tldc_introduction.html That link shows up as "Introduction — The ThinLinc Administrator's Guide ... - Cendio" in Google, despite it not being a general introduction but rather an introduction to TLDC. This is probably out-of-scope of this issue, but is still something worth considering.
