See the screenshot below to see what I mean. Basically, Intellij only highlights the box I draw with the cursor, but leaves the rest of the editor untouched. I have no idea why it happens, and the only way to resolve it for now is to close and reopen the editor. I have observed the same behavior on a Linux box and a MacBook, both when editing Java and PHP files, so I am not sure it's a bug.
The desired behaviour is standard row selection, i.e. highlight all rows which I drag the cursor over.
In the Settings/Preferences dialog ( Ctrl+Alt+S ), select Editor | Inspections. Locate the inspection you want to disable, and clear the checkbox next to it. Apply the changes and close the dialog.
You can turn off cursor blinking by going to Settings, Editor, General, Appearance and untick Caret blinking .
Add or remove carets at selected locations using mouse Alt+Shift+Click at the target location to add another caret. Alt+Shift+Click at one of the multiple carets to remove it.
You can run a process with ⌃R (macOS), or Shift+F10 (Windows/Linux). To stop a process, you can use ⌘F2 on macOS, or Ctrl+F2 on Windows/Linux.
I think you have enabled 'column selection'.
Option can be toggled via these methods:
Menu Bar ->
Edit
->Column selection mode
Document Body ->
Right Click
->Column selection mode
Keyboard Shortcut ->
ALT + SHIFT + INSERT
The column select mode is enabled, use Alt+Shift+Insert to enable or disable this mode.
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