[TheLastSuperman]

Is this a 100% default style? If no then create a new style, is the issue present there?

You may simply need to create a new style and add in some custom css using @media definitions

Rough example:

@media screen and (min-width: 980px) /* Desktop */ {
  body {
    background: red;
  }
}

@media screen  and (max-width: 979px) /* Tablet */ {
  body {
    background: blue;
  }
}

@media screen and (max-width: 500px) /* Mobile */ {
  body {
    background: green;
  }
}

So we'd use the Inspect Element feature in the browser, find the css for the main table and then sidebar portion then adjust to suit using min or max @media then on your tablet viola it would look as-desired.