After create 3 new post-types in the adminmenu, the sidebar of the wp-admin hide some elements on hover and on active submenus, I try some changes in the height, display and position of the elements, but I don’t where is the problem. See the image:
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That’s a bug in Chrome and not a mistake you have made. It’s being caused by something called “slimming paint” which is enabled by default.
This bug is in Chrome, Follow these solutions
Official Solution:
Disable slimmingPaint feature in chrome
Other Solution:
If you or your clients donât want to disable the Slimming Paint feature, then you can get around the bug by adding the following code into your theme functions.php file: