Pressing " Cmd" related functions on iPad Pro magic keyboard seems to crashes the sidecar

Greetings, Eltonxb.

Welcome to the Apple Support Communities. We can understand why you’d want to resolve the issue with using the Command ⌘ Key and SideCar crashing. 

When you are tapping the Command Key, are you trying to use any of these commands?

“Most iPad keyboard shortcuts use the Command ⌘ key, like on a Mac. If you're more familiar with a PC keyboard, the Command ⌘ key does the same thing as the Control key on a PC.

Here are some common keyboard shortcuts:

• Command-H: Go to the Home screen.
• Command-Space bar: Show or hide the Search field.
• Command-Tab: Switch to the next most recently used app among your open apps.
• Command-Shift-3: Take a screenshot.
• Command-Shift-4: Take a screenshot and immediately open Markup to view or edit it.
• Command-Option-D: Show or hide the Dock.” Learn iPad keyboard shortcuts

If so, does it happen if you press the other key before pressing the Command Key?

Also, please ensure that you’ve updated iPadOS 15.0.1: About iPadOS 15 Updates 

We hope this helps! Thanks for being a part of the community.

Sincerely.

Hey there, Eltonxb.

Thanks for getting back to us. To clarify, does the keyboard work as expected with the exception of “CMD+A”?

Do you have any customized keyboard shortcuts showing?

“Customize keyboard shortcuts

1. Open Settings, then tap Accessibility.
2. Tap Keyboards.
3. Tap Full Keyboard Access and turn it on.
4. Tap Commands.
5. Tap a command, then press a custom key combination to assign to it.
6. Tap Done.” Learn iPad keyboard shortcuts

If not, what happens if you try to assign a shortcut of CMD+A?

Warmly.

I am having this issue as well, any CMD shortcuts just lock the screen and disconnects sidecar from the iPad and Macbook. Everything is the latest version, just bought this iPad with Magic Keyboard 2 weeks ago.

I code so I heavily use those shortcuts with the Magic Keyboard without thinking so it locks out frequently. A fix for this would be amazing, even just an option to disable native iPad shortcuts while in Sidecar. I see this issue frequently in the forums so its definitely a problem that needs to be addressed.

Thanks.

Hi, Eltonxb.

Thanks for letting us know. At this point, it would be best to Contac Apple Support.

Best wishes.