Is maOS issue…

To diable OSX key mapping just follow below steps:

Click on Apple icon => System Preference => keyboard => shortcuts => App shortcuts=> uncheck show help menu

Source: https://intellij-support.jetbrains.com/hc/en-us/community/posts/207675825-Mac-OS-X-comment-block-command-slash?flash_digest=d0e03a17a258ff4b3bcf2c2a178a145d1b75bb3d