Well, I was wondering how does it work, I mean, What's necessary to get this funtion work.. When you're reading something you see that there's is an options it lets you to get in a reading mode but sometimes some web pages won't let you do that
How does it work?
To show reading mode (shift + comand + R)
To show the list bookmarks (shift + cmd + L)
Thank you very much
Then there's something going on with Safari on your Mac.
Try troubleshooting Safari extensions and third party plugins.
From the Safari menu bar click Safari > Preferences then select the Extensions tab. Turn that OFF, quit and relaunch Safari to test. If that helped, turn one extension on then quit and relaunch Safari to test until you find the incompatible extension then click uninstall.
If it's not an extensions issue, try troubleshooting third party plug-ins.
Back to Safari > Preferences. This time select the Security tab. Deselect: Allow all other plug-ins. Quit and relaunch Safari to test.
If that made a difference, instructions for troubleshooting plugins here.