Free Transform Tool and Dimension Tool have several modes presented in small floating modal panels and appear only when the tool is picked.

However, their z-order makes them hide under other floating panels, making it hard to find these pseudo-panels if a user choose to have real panels floating in the spot.

It’s easy to locate them by hitting Tab, since they doesn’t get hidden like actual panels and toolbars, but you have to know the trick.

I think their order should be above and not below.