Hi, thanks for posting. Have you checked your hotkeys file from the Spine settings menu?
I checked mine and my hotkeys for creating, deleting, and modifying meshes are currently unset, as you can see in the screenshot.
To set them, click the Spine logo in the top left corner and then click settings, or press F12 on your keyboard. Go to the Application tab and look under Files -> Hotkeys and click the Open button. CTRL/CMD-F should help you quickly find the place to set them.