Refer: https://dev.to/yuyabu/how-to-use-caps-lock-key-as-esc-on-ubuntu-18-1g7l
Gnome Tweaks as a "Keyboard & Mouse Section", "Addtional Layout Options"
Currently using two tweaks because my old USB keyboard for an iPad DOES NOT have an escape key.
Choose "Caps Lock behavior', "Make Caps Lock and addtional Escape"
Since Caps Lock is remapped also adding a tweak to make using both shift keys to enable Caps Lock, and one shift key to disable Caps Lock
"Miscellaneous Compatibility Options", "Both Shift together enables Caps Lock; one Shift key disbles it"