[7.0.0-beta.1] Icons not arranged in a grid - Pop-up window for VM icon selection

Description

While editing a VM, clicking its icon to change it creates a pop-up showing all the icons currently available on the boot drive to assign to the VM. Normally the icons are arranged in a grid within the window, which can scroll down to reveal more icons.

In 7.0.0-beta.1 the contents appear in a single horizontal line and disappear off the right side of the window. The window can be scrolled to the right which allows selecting other icons.

This is what it looks like in the current beta

And this is what it looks like in 6.12.10

Expectation

Expected to see a grid of icons as in previous releases.

Steps to reproduce

1. Open VM Management tab
2. Click on any VM to edit
3. Click on the VM icon at the top of the window
4. The pop-up icon list will appear

Regression

Looks as expected in 6.12.10 as displayed in attached screen shot above