Assign to Dock - not working

If the above doesn't work, try doing a Dock restart using the following Terminal command:

killall Dock

Log out/in and test. If that doesn’t work, you need to look in your user Library/Application Support/Dock for the .db. Use the Finder “Go To Folder” command. Enter ~/Library/Application Support/Dock. Move the .db to your desktop.

Then try a dock reset.

Applications/Utilities/Terminal enter the command

killall Dock

Log out/in test. If it works okay, delete the .db from the desktop.

If the Dock is the same, return the .db to where you got them from, overwriting the newer ones.

If you prefer to make your user library permanently visible, go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Learned from leonie.

In Mission Control System Preferences, disable "Automatically rearrange spaces based on most recent use."

Move to Desktop 2 and then open Safari, now Control click on the Safari icon in the Dock and click on Options and click on This Desktop. Safari will now be Assigned To Desktop 2.