Use Find Action ⇧⌘A (on Mac) or Control+Shift+A (on Windows/Linux) to open the Find Action dialog and search for "Show line numbers" OFF/ON for a file. Or open Preferences > Editor > General > Appearance to turn "Show line numbers" on/off.
Turn show line numbers off and on
Use Find Action ⇧⌘A (on Mac) or Control+Shift+A (on Windows/Linux) to open the Find Action dialog and search for "Show line numbers" OFF/ON for a file. Or open Preferences > Editor > General > Appearance to turn "Show line numbers" on/off.