I used you DoclingMegaDemo and added the Metropolis skin.
The recorded video shows 4 issues
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The upper splitter area between caption of the panels does not show the splitter cursor (Video: 10s-15s). With other skins this issue does not appear or ar least not that harsh.
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The splitter sometime hangs. This does not happen every time but is good to reproduce the way the video shows it (Video: 24s-30s).
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The splitter "feedback line" is always rendered with an offset (a few pixel left) to the splitter cursor (Video: 21s…)
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The splitter is not exactly at the position where the "feedback line" has been dragged, not even where the cursor MouseUp occured - is always a bit to the right (Video: 38/39s). Thus exact arrangement of panel is not possible. It always needs some attempts.
Issues 2.-4. are independent from skins, but also appear with vertical splitters!
P.S. Sorry for putting several issue into one ticket.