Permantly keep the widgets at right open?

You cannot keep the Notification Center open permanently.

You can, however, use a Hot Corner to activate the Notification panel at will.

Go to System Preferences > Mission Control and click the Hot Corners button at the lower left. Set one of the screen corners to activate Notification Center, and when you put the cursor into that corner the Notification Center panel will appear or disappear.

I set my upper right corner for this. When I wish to see notifications and widgets I just put the cursor in that corner. 👍🏽

You're welcome. 🙂

Not designed to remain permanently visible. Use F6 to toggle them on or off the screen as needed.