try right clicking the grey bar and selecting show line numbers
it works for me so hopefully it will for u too

or change it in the settings
File > Settings > Editor > Appearance then click the “Show line numbers” box.
try right clicking the grey bar and selecting show line numbers
it works for me so hopefully it will for u too

or change it in the settings
File > Settings > Editor > Appearance then click the “Show line numbers” box.