FIXED - I updated from Windows 10 to Windows 11 on my Dell Inspiron 7506 2n1. Afterwards, my left Shift key as well as the ability to highlight, drag and drop stopped working. This was on my laptop keyboard as well as on my Bluetooth mouse and keyboard.
FIXED - I removed the Bluetooth Pen Device (which I never use anyway) and everything began working normally.
STEP I took:
- Open Bluetooth & Device under Settings.
- Under "Input" click on the 3 dots beside the Bluetooth Pen (mine was PN771M).
- Remove Device.
I have since reconnected the Bluetooth Pen and everything seems to be working fine. But, if it happens again, I'm just going to Remove the Pen permanently. I noticed many of the posts reference using Dell Inspiron laptops, so perhaps this will help others.
I was about to lose my mind and trash the computer. Hopefully, this will help you too.