No lowercase letters can be entered globally, only uppercase letters are allowed

[wuyanbo5210]

I don’t know what combination of keys I pressed, and now I can’t type lowercase letters. Moreover, the lowercase letters in other documents have also become uppercase letters.
Like this

and this

However, except for obsidian, all other applications are functioning normally.

[Jopp]

Disable step by step themes then snippets then plugins to find out the root causes.
Also, did you check if your keyboard is ok or if 3rd party apps change your keyboard functions ?

[wuyanbo5210]

I finally resolved it by deleting the .obsidian file.