Keeping bookmark list open in safari sidebar?

Hello, MDMac808.

This article provides all of the ways you can customize your Safari browser on your Mac: Customize the Safari browser window on Mac - Apple Support.

If there is something you'd like to see added that is not currently, please let us know! Apple welcomes all thoughts, comments and suggestions, on your Safari or any other Apple products and services. Send in feedback on this here: Product Feedback.

Let us know if we can help with anything else at all. Thanks and have a fabulous day!

MDMac808,

Does this only occur after restarting your Mac and relaunching Safari, or does this occur every time you open a new Safari window?

If you create a new Administrator account, and test that behavior from there, does it still persist? Set up users, guests, and groups on Mac - Apple Support That should help to further isolate this behavior to either an account specific or system wide behavior.

Let us know your results, and we'll keep moving forward from there.