Unfortunately it’s not possible to colour rows, only columns. Instead, you could manually add Header Rows by right-clicking on the top row of the watchlist and select Insert Header Row and name it eg Top 10, then add another on the 11th row and give it a name (note: this will not work for lists linked to a Symbol List – it has to be unlinked).
You can then right-click on the column and select the Summary Type for that column, eg Count, or Average which will be displayed in the header row for each group:
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