Make it possible to show layers in more than one column.

[ZhangX]

Perhaps the layers (including inner components) should be able to display in more than one column, similar to how Windows Explorer displays a list of files in many columns.
The reason for this requirement is that, unlike artists who handcraft one component after another, I work with scientific plots in Designer, and the imported figures typically have hundreds of components (such as axis ticks and tick labels, data points, and so on); this means a lot of dragging and searching in a single-column setting, which could be made easier by introducing more columns of layer display.
Display space isn't a problem since I always use a floating window for layers.