WordPress admin menu formatting issue

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Otto has suggested a fix in Chrome itself until the bug is resolved:

  • Go to chrome://flags/#disable-slimming-paint
  • Enable the “Disable slimming paint” option.
  • Ensure that the “Enable slimming paint” option below it is not turned on.
  • Relaunch Chrome.

If you don’t want to take this approach you can fix this with CSS:

function chromefix_inline_css()
{ 
  wp_add_inline_style( 'wp-admin', '#adminmenu { transform: translateZ(0); }' );
}

add_action('admin_enqueue_scripts', 'chromefix_inline_css');

If you just want a plugin to do it: https://github.com/raffjones/chrome-admin-menu-fix