Business background
 use  phpstorm  for front-end development 
 often reduce  ide   ps   browser  to 1 / 3 of the width of the screen 
 horizontal juxtaposition to display 
 so the editing interface of 
  ps  is relatively small, so  alt+1  is often used to hide and show the resource list on the left 
troubles encountered
 the regular shortcut will fail.. I don"t know why ~ 
 and then I can only use the mouse to hide the resource list on the left manually. It feels troublesome 
try
 worry about the shortcut key conflict. Turn off  phpstorm  and try  alt+1  
 in other software. No conflict is found. 
question
how to locate this problem and solve it?
solve
 if not upgraded or reinstalled. There is a temporary solution 
 that is to press  alt  twice in a row and it will pop up ~ ~ you just need to click on it yourself 
