Try apply this following css into this custom css file and see how it goes.

JoomlaFolder/templates/elegant/css/custom.css

#eb .eb-dashboard-sticky-header.affix {

    z-index: 100000 !important;

}

Now it is hiding the Docker..
See the screen shot..

It seems like you already added some fix on your site based on what i checked.

Keep us update if you need further assistance on this.

Ok..No problem.. I added 1 more coding and tried ..It is working perfectly. See the coding below.

#eb .eb-dashboard-sticky-header.affix {
z-index: 10000 !important;
margin-top: 0.75cm;
}

Yes, it seems look fine. Glad to heard you can manage to fix this.

As a gentle reminder, kindly start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiry. I will lock and mark this thread as resolved.