I posted an idea 💡 long back in March 2019 on IdeaExchange to support Safari-styled reader's view on Trailhead. This is a very soothing reading experience and easy on the eyes, especially on web browsers.

The following video gives a walk-thru of why such a reading experience can be more fun on Trailhead and also gives a simple hack to get it on Chrome and Safari.

Boosting Trailhead Experience - Next Steps

• Upvote the idea to get this feature natively on Trailhead and other Salesforce blogs and digital properties - https://ideas.salesforce.com/s/idea/a0B8W00000GdbfMUAR/support-safaris-reader-view-for-trailhead

• Install Postlight Reader extension for Chrome, it works on Trailhead and any other websites/blogs/etc - https://chrome.google.com/webstore/detail/postlight-reader/oknpjjbmpnndlpmnhmekjpocelpnlfdi

• Or use Safari's reader view - https://www.makeuseof.com/how-to-use-reader-view-in-safari/ - you can make it open by default on Trailhead

• Hopefully, Brave and Edge browser users can also get the same Postlight Reader as it's on the same Chromium Platform.