When the dock is placed at the top, opening palettes (like Swatches) overlaps and blocks:
• Document tabs (when many are open)
• The double arrow used to access hidden tabs
• The rightmost part of the ruler

When the dock is placed at the bottom, palettes don’t block the document tabs, but they still cover part of the ruler.

The palettes should dynamically adjust so they never block tabs, the tab overflow control, or the ruler—regardless of dock position.