Thanks for your response.
It’s true that text edit works fine when you enter it with mouse cursor clicking as the video in your response shows. But what I want to suppose is that, when you extract some sentences from textbook and then you make quick modification on the generated excerpt by typing ⌘ ⏎, or when you make a successive text edit and you’d like to switch to another part-of-card or another card by typing ⌘ ↑/↓. And when you enter text editing by keyboard shortcut, what I reflected would appear.
Though it’s not a big problem as that you can then type ⌘ A to select all and edit text, but it could be an improvement or convenience if it can directly enter the mode of all-text-being-selected as which most other applications are doing.